diff --git a/README.md b/README.md
index a7aa035285634..a27b33a887081 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,20 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `Base.Random.randmtzig_exprnd` is now `randexp` [#9144](https://github.com/JuliaLang/julia/pull/9144)
 
+## New macros
+
+* `@inline` and `@noinline` have been added. On 0.3, these are "no-ops," meaning they don't actually do anything.
+
 ## Other syntax changes
 
 * `Dict(ks, vs)` is now `Dict(zip(ks, vs))` [#8521](https://github.com/JuliaLang/julia/pull/8521)
+
+## Developer tips
+
+If you're adding additional compatibility code to this package, the following shell script is a useful for extracting the version number from a git commit SHA:
+
+```sh
+#! /bin/bash
+last_tag=$(git describe --tags --abbrev=0)
+git rev-list $1 ^$last_tag | wc -l | sed -e 's/[^[:digit:]]//g'
+```
diff --git a/src/Compat.jl b/src/Compat.jl
index c4de0e2d5fc71..df526ea9eb471 100644
--- a/src/Compat.jl
+++ b/src/Compat.jl
@@ -101,6 +101,18 @@ function rewrite_split(ex, f)
     end
 end
 
+if VERSION < v"0.4.0-dev+707"
+    macro inline(ex)
+        esc(ex)
+    end
+end
+
+if VERSION < v"0.4.0-dev+2099"
+    macro noinline(ex)
+        esc(ex)
+    end
+end
+
 function _compat(ex::Expr)
     if ex.head == :call
         f = ex.args[1]
@@ -118,6 +130,6 @@ macro compat(ex)
     esc(_compat(ex))
 end
 
-export @compat
+export @compat, @inline, @noinline
 
 end # module