diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
index 164f099e98852..251b1b10b05c1 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -28,7 +28,7 @@ import {
   enableSchedulerTracing,
   enableProfilerTimer,
   enableSuspenseServerRenderer,
-  enableUpdateSchedulerTracking,
+  enableUpdaterTracking,
   enableEventAPI,
 } from 'shared/ReactFeatureFlags';
 import {
@@ -105,7 +105,7 @@ import {
   captureCommitPhaseError,
   requestCurrentTime,
   resolveRetryThenable,
-  restorePendingSchedulers,
+  restorePendingUpdaters,
 } from './ReactFiberScheduler';
 import {
   NoEffect as NoHookEffect,
@@ -1346,9 +1346,9 @@ function commitSuspenseComponent(
         if (enableSchedulerTracing) {
           retry = Schedule_tracing_wrap(retry);
         }
-        if (enableUpdateSchedulerTracking) {
-          // If we have pending work still, restore the original schedulers
-          restorePendingSchedulers(finishedRoot, committedExpirationTime);
+        if (enableUpdaterTracking) {
+          // If we have pending work still, restore the original updaters
+          restorePendingUpdaters(finishedRoot, committedExpirationTime);
         }
         retryCache.add(thenable);
         thenable.then(retry, retry);
diff --git a/packages/react-reconciler/src/ReactFiberRoot.js b/packages/react-reconciler/src/ReactFiberRoot.js
index 4999404ba825e..14e8b2f19f68d 100644
--- a/packages/react-reconciler/src/ReactFiberRoot.js
+++ b/packages/react-reconciler/src/ReactFiberRoot.js
@@ -19,7 +19,7 @@ import {createHostRootFiber} from './ReactFiber';
 import {NoWork} from './ReactFiberExpirationTime';
 import {
   enableSchedulerTracing,
-  enableUpdateSchedulerTracking,
+  enableUpdaterTracking,
 } from 'shared/ReactFeatureFlags';
 import {unstable_getThreadID} from 'scheduler/tracing';
 
@@ -33,8 +33,8 @@ export type Batch = {
 
 export type PendingInteractionMap = Map<ExpirationTime, Set<Interaction>>;
 
-// Map of expiration time to all pending "schedulers" which in turn is a map of Fibers to reference counts.
-export type PendingSchedulersMap = Map<ExpirationTime, Set<Fiber>>;
+// Map of expiration time to all pending "updaters" which in turn is a map of Fibers to reference counts.
+export type PendingUpdatersMap = Map<ExpirationTime, Set<Fiber>>;
 
 type BaseFiberRootProperties = {|
   // The type of root (legacy, batched, concurrent, etc.)
@@ -91,9 +91,9 @@ type ProfilingOnlyFiberRootProperties = {|
 
 // The following attributes are only used by DevTools and are only present in DEV builds.
 // They enable DevTools Profiler UI to show which Fiber(s) scheduled a given commit.
-type SchedulerTrackingOnlyFiberRootProperties = {|
-  memoizedSchedulers: Set<Fiber>,
-  pendingSchedulersMap: PendingSchedulersMap,
+type UpdaterTrackingOnlyFiberRootProperties = {|
+  memoizedUpdaters: Set<Fiber>,
+  pendingUpdatersMap: PendingUpdatersMap,
 |};
 
 // Exported FiberRoot type includes all properties,
@@ -104,7 +104,7 @@ type SchedulerTrackingOnlyFiberRootProperties = {|
 export type FiberRoot = {
   ...BaseFiberRootProperties,
   ...ProfilingOnlyFiberRootProperties,
-  ...SchedulerTrackingOnlyFiberRootProperties,
+  ...UpdaterTrackingOnlyFiberRootProperties,
 };
 
 function FiberRootNode(containerInfo, tag, hydrate) {
@@ -132,9 +132,9 @@ function FiberRootNode(containerInfo, tag, hydrate) {
     this.pendingInteractionMap = new Map();
   }
 
-  if (enableUpdateSchedulerTracking) {
-    this.memoizedSchedulers = new Set();
-    this.pendingSchedulersMap = new Map();
+  if (enableUpdaterTracking) {
+    this.memoizedUpdaters = new Set();
+    this.pendingUpdatersMap = new Map();
   }
 }
 
diff --git a/packages/react-reconciler/src/ReactFiberScheduler.js b/packages/react-reconciler/src/ReactFiberScheduler.js
index d45b04710f5e5..5cf623ee0005e 100644
--- a/packages/react-reconciler/src/ReactFiberScheduler.js
+++ b/packages/react-reconciler/src/ReactFiberScheduler.js
@@ -19,7 +19,7 @@ import type {Interaction} from 'scheduler/src/Tracing';
 import {
   warnAboutDeprecatedLifecycles,
   enableUserTimingAPI,
-  enableUpdateSchedulerTracking,
+  enableUpdaterTracking,
   enableSuspenseServerRenderer,
   replayFailedUnitOfWorkWithInvokeGuardedCallback,
   enableProfilerTimer,
@@ -337,14 +337,14 @@ export function scheduleUpdateOnFiber(
     return;
   }
 
-  if (enableUpdateSchedulerTracking) {
-    const pendingSchedulersMap = root.pendingSchedulersMap;
-    let schedulers = pendingSchedulersMap.get(expirationTime);
-    if (schedulers == null) {
-      schedulers = new Set();
-      pendingSchedulersMap.set(expirationTime, schedulers);
+  if (enableUpdaterTracking) {
+    const pendingUpdatersMap = root.pendingUpdatersMap;
+    let updaters = pendingUpdatersMap.get(expirationTime);
+    if (updaters == null) {
+      updaters = new Set();
+      pendingUpdatersMap.set(expirationTime, updaters);
     }
-    schedulers.add(fiber);
+    updaters.add(fiber);
   }
 
   root.pingTime = NoWork;
@@ -1296,7 +1296,7 @@ function commitRootImpl(root) {
 
     if (enableSchedulerTracing) {
       if (firstPendingTimeBeforeCommit !== NoWork) {
-        restorePendingSchedulers(root, root.lastPendingTime);
+        restorePendingUpdaters(root, root.lastPendingTime);
       }
     }
   }
@@ -2182,21 +2182,21 @@ function warnIfNotCurrentlyActingUpdatesInDEV(fiber: Fiber): void {
   }
 }
 
-export function restorePendingSchedulers(
+export function restorePendingUpdaters(
   root: FiberRoot,
   expirationTime: ExpirationTime,
 ): void {
-  if (!enableUpdateSchedulerTracking) {
+  if (!enableUpdaterTracking) {
     return;
   }
-  const pendingSchedulersMap = root.pendingSchedulersMap;
-  let schedulers = pendingSchedulersMap.get(expirationTime);
-  if (schedulers == null) {
-    schedulers = new Set();
-    pendingSchedulersMap.set(expirationTime, schedulers);
+  const pendingUpdatersMap = root.pendingUpdatersMap;
+  let updaters = pendingUpdatersMap.get(expirationTime);
+  if (updaters == null) {
+    updaters = new Set();
+    pendingUpdatersMap.set(expirationTime, updaters);
   }
-  root.memoizedSchedulers.forEach(schedulingFiber => {
-    ((schedulers: any): Set<Fiber>).add(schedulingFiber);
+  root.memoizedUpdaters.forEach(schedulingFiber => {
+    ((updaters: any): Set<Fiber>).add(schedulingFiber);
   });
 }
 
@@ -2317,13 +2317,13 @@ function schedulePendingInteraction(root, expirationTime) {
 function startWorkOnPendingInteraction(root, expirationTime) {
   // This is called when new work is started on a root.
 
-  if (enableUpdateSchedulerTracking) {
-    const memoizedSchedulers: Set<Fiber> = new Set();
-    const pendingSchedulersMap = root.pendingSchedulersMap;
-    pendingSchedulersMap.forEach((schedulers, scheduledExpirationTime) => {
+  if (enableUpdaterTracking) {
+    const memoizedUpdaters: Set<Fiber> = new Set();
+    const pendingUpdatersMap = root.pendingUpdatersMap;
+    pendingUpdatersMap.forEach((updaters, scheduledExpirationTime) => {
       if (scheduledExpirationTime >= expirationTime) {
-        pendingSchedulersMap.delete(scheduledExpirationTime);
-        schedulers.forEach(fiber => memoizedSchedulers.add(fiber));
+        pendingUpdatersMap.delete(scheduledExpirationTime);
+        updaters.forEach(fiber => memoizedUpdaters.add(fiber));
       }
     });
 
@@ -2331,7 +2331,7 @@ function startWorkOnPendingInteraction(root, expirationTime) {
     // We can re-use it in hot functions like renderRoot() without having to
     // recalculate it. This also provides DevTools with a way to access it when
     // the onCommitRoot() hook is called.
-    root.memoizedSchedulers = memoizedSchedulers;
+    root.memoizedUpdaters = memoizedUpdaters;
   }
 
   if (enableSchedulerTracing) {
diff --git a/packages/react-reconciler/src/ReactFiberUnwindWork.js b/packages/react-reconciler/src/ReactFiberUnwindWork.js
index a5dc9b5bc23d6..2e1808543af7b 100644
--- a/packages/react-reconciler/src/ReactFiberUnwindWork.js
+++ b/packages/react-reconciler/src/ReactFiberUnwindWork.js
@@ -40,7 +40,7 @@ import {
 import {
   enableSchedulerTracing,
   enableSuspenseServerRenderer,
-  enableUpdateSchedulerTracking,
+  enableUpdaterTracking,
   enableEventAPI,
 } from 'shared/ReactFeatureFlags';
 import {NoMode, BatchedMode} from './ReactTypeOfMode';
@@ -77,7 +77,7 @@ import {
   pingSuspendedRoot,
   resolveRetryThenable,
   checkForWrongSuspensePriorityInDEV,
-  restorePendingSchedulers,
+  restorePendingUpdaters,
 } from './ReactFiberScheduler';
 
 import invariant from 'shared/invariant';
@@ -189,9 +189,9 @@ function attachPingListener(
     if (enableSchedulerTracing) {
       ping = Schedule_tracing_wrap(ping);
     }
-    if (enableUpdateSchedulerTracking) {
-      // If we have pending work still, restore the original schedulers
-      restorePendingSchedulers(root, renderExpirationTime);
+    if (enableUpdaterTracking) {
+      // If we have pending work still, restore the original updaters
+      restorePendingUpdaters(root, renderExpirationTime);
     }
     thenable.then(ping, ping);
   }
@@ -209,9 +209,9 @@ function throwException(
   // Its effect list is no longer valid.
   sourceFiber.firstEffect = sourceFiber.lastEffect = null;
 
-  if (enableUpdateSchedulerTracking) {
-    // If we have pending work still, restore the original schedulers
-    restorePendingSchedulers(root, renderExpirationTime);
+  if (enableUpdaterTracking) {
+    // If we have pending work still, restore the original updaters
+    restorePendingUpdaters(root, renderExpirationTime);
   }
 
   if (
diff --git a/packages/react-reconciler/src/__tests__/ReactSchedulers-test.internal.js b/packages/react-reconciler/src/__tests__/ReactUpdaters-test.internal.js
similarity index 95%
rename from packages/react-reconciler/src/__tests__/ReactSchedulers-test.internal.js
rename to packages/react-reconciler/src/__tests__/ReactUpdaters-test.internal.js
index ecbcee9c3f6de..6dd4ef189b9fe 100644
--- a/packages/react-reconciler/src/__tests__/ReactSchedulers-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/ReactUpdaters-test.internal.js
@@ -18,7 +18,7 @@ let mockDevToolsHook;
 let allSchedulerTags;
 let allSchedulerTypes;
 
-describe('schedulers', () => {
+describe('updaters', () => {
   beforeEach(() => {
     jest.resetModules();
 
@@ -31,7 +31,7 @@ describe('schedulers', () => {
         Scheduler.yieldValue('onCommitRoot');
         const schedulerTags = [];
         const schedulerTypes = [];
-        fiberRoot.memoizedSchedulers.forEach(fiber => {
+        fiberRoot.memoizedUpdaters.forEach(fiber => {
           schedulerTags.push(fiber.tag);
           schedulerTypes.push(fiber.elementType);
         });
@@ -48,7 +48,7 @@ describe('schedulers', () => {
     );
 
     ReactFeatureFlags = require('shared/ReactFeatureFlags');
-    ReactFeatureFlags.enableUpdateSchedulerTracking = true;
+    ReactFeatureFlags.enableUpdaterTracking = true;
     ReactFeatureFlags.debugRenderPhaseSideEffectsForStrictMode = false;
 
     React = require('react');
@@ -221,9 +221,6 @@ describe('schedulers', () => {
     expect(allSchedulerTypes[4]).toHaveLength(1);
     expect(allSchedulerTypes[4]).toContain(CascadingChild);
 
-    // Question: Should SchedulingComponent also be reported for the cascading updates?
-    // I have mixed feelings about this; it's easier not to include it so...
-
     // Verify no outstanding flushes
     Scheduler.flushAll();
   });
@@ -397,9 +394,7 @@ describe('schedulers', () => {
     mockDevToolsHook.onCommitRoot.mockImplementation(fiberRoot => {
       Scheduler.yieldValue('onCommitRoot');
       schedulerTypes.push(
-        Array.from(fiberRoot.memoizedSchedulers).map(
-          fiber => fiber.elementType,
-        ),
+        Array.from(fiberRoot.memoizedUpdaters).map(fiber => fiber.elementType),
       );
     });
 
@@ -417,14 +412,11 @@ describe('schedulers', () => {
     expect(schedulerTypes[1]).toHaveLength(1);
     expect(schedulerTypes[1]).toContain(ErrorBoundary);
 
-    // Question: Should Parent also be reported in the second schedulers set?
-    // I have mixed feelings about this; it's easier not to include it so...
-
     // Verify no outstanding flushes
     Scheduler.flushAll();
   });
 
-  it('should distinguish between schedulers in the case of interleaved work', () => {
+  it('should distinguish between updaters in the case of interleaved work', () => {
     let triggerLowPriorityUpdate = null;
     let triggerSyncPriorityUpdate = null;
 
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index a4492d9b0943b..88d9cb9d47d26 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -32,7 +32,7 @@ export const enableProfilerTimer = __PROFILE__;
 export const enableSchedulerTracing = __PROFILE__;
 
 // Track which Fiber(s) schedule render work.
-export const enableUpdateSchedulerTracking = __PROFILE__;
+export const enableUpdaterTracking = __PROFILE__;
 
 // Only used in www builds.
 export const enableSuspenseServerRenderer = false; // TODO: __DEV__? Here it might just be false.
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index b11ace5f41caf..a70bdcd6eae6f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -19,7 +19,7 @@ export const {debugRenderPhaseSideEffects} = require('ReactFeatureFlags');
 export const enableUserTimingAPI = __DEV__;
 export const enableProfilerTimer = __PROFILE__;
 export const enableSchedulerTracing = __PROFILE__;
-export const enableUpdateSchedulerTracking = __PROFILE__;
+export const enableUpdaterTracking = __PROFILE__;
 export const enableSuspenseServerRenderer = false;
 export const enableStableConcurrentModeAPIs = false;
 export const warnAboutShorthandPropertyCollision = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 487cb083c15b6..14080c617f579 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -19,7 +19,7 @@ export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
 export const warnAboutDeprecatedLifecycles = true;
 export const enableProfilerTimer = __PROFILE__;
 export const enableSchedulerTracing = __PROFILE__;
-export const enableUpdateSchedulerTracking = __PROFILE__;
+export const enableUpdaterTracking = __PROFILE__;
 export const enableSuspenseServerRenderer = false;
 export const disableJavaScriptURLs = false;
 export const disableYielding = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.persistent.js b/packages/shared/forks/ReactFeatureFlags.persistent.js
index 8d6c91e08394c..d30a778a0db76 100644
--- a/packages/shared/forks/ReactFeatureFlags.persistent.js
+++ b/packages/shared/forks/ReactFeatureFlags.persistent.js
@@ -19,7 +19,7 @@ export const warnAboutDeprecatedLifecycles = true;
 export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
 export const enableProfilerTimer = __PROFILE__;
 export const enableSchedulerTracing = __PROFILE__;
-export const enableUpdateSchedulerTracking = __PROFILE__;
+export const enableUpdaterTracking = __PROFILE__;
 export const enableSuspenseServerRenderer = false;
 export const disableJavaScriptURLs = false;
 export const disableYielding = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index 06a1f04d05e7f..98e54184907df 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -19,7 +19,7 @@ export const warnAboutDeprecatedLifecycles = false;
 export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
 export const enableProfilerTimer = false;
 export const enableSchedulerTracing = false;
-export const enableUpdateSchedulerTracking = false;
+export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = false;
 export const disableJavaScriptURLs = false;
 export const disableYielding = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index f708fb31217b4..23e43b18bc911 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -19,7 +19,7 @@ export const warnAboutDeprecatedLifecycles = true;
 export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
 export const enableProfilerTimer = false;
 export const enableSchedulerTracing = false;
-export const enableUpdateSchedulerTracking = false;
+export const enableUpdaterTracking = false;
 export const enableSuspenseServerRenderer = false;
 export const enableStableConcurrentModeAPIs = false;
 export const enableSchedulerDebugging = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index deb5f2fd82db5..5b46f4838e15b 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -32,7 +32,7 @@ export let enableUserTimingAPI = __DEV__;
 
 export const enableProfilerTimer = __PROFILE__;
 export const enableSchedulerTracing = __PROFILE__;
-export const enableUpdateSchedulerTracking = __PROFILE__;
+export const enableUpdaterTracking = __PROFILE__;
 export const enableSchedulerDebugging = true;
 
 export const enableStableConcurrentModeAPIs = false;