diff --git a/packages/gatsby/src/utils/api-browser-docs.js b/packages/gatsby/src/utils/api-browser-docs.js
index 31894814b7145..2c5ead601a2a4 100644
--- a/packages/gatsby/src/utils/api-browser-docs.js
+++ b/packages/gatsby/src/utils/api-browser-docs.js
@@ -129,7 +129,7 @@ exports.disableCorePrefetching = true
 exports.replaceHydrateFunction = true
 
 /**
- * Inform plugins of when a service worker has been installed.
+ * Inform plugins when a service worker has been installed.
  */
 exports.onServiceWorkerInstalled = true
 
@@ -141,11 +141,11 @@ exports.onServiceWorkerInstalled = true
 exports.onServiceWorkerUpdateFound = true
 
 /**
- * Inform plugins of when a service worker has become active.
+ * Inform plugins when a service worker has become active.
  */
 exports.onServiceWorkerActive = true
 
 /**
- * Inform plugins of when a service worker is redundant.
+ * Inform plugins when a service worker is redundant.
  */
 exports.onServiceWorkerRedundant = true