diff --git a/packages/babel-helper-simple-access/README.md b/packages/babel-helper-simple-access/README.md
index bbb7fb791d..b6083b57d4 100644
--- a/packages/babel-helper-simple-access/README.md
+++ b/packages/babel-helper-simple-access/README.md
@@ -1,7 +1,7 @@
 # babel-helper-simple-assignment
 
 There are many cases where it is hard to perform transformations because a
-piece of code using complex structures. Say you want to rewrite all accesses
+piece of code is using complex structures. Say you want to rewrite all accesses
 to a given variable, and there are cases like
 
 ```
@@ -11,7 +11,15 @@ i += 1
 
 It is difficult to work with.
 
-This helper can handle converting these to simple access patterns of
+This helper can handle converting these to simple access patterns of standard
+assignment. This plugin does _not_ handle
+
+```
+{ a } = foo;
+```
+
+so assignment to patterns still needs to be handled when you are processing
+updates to values.
 
 ## Usage