Better error messages for some undefines. This fixes #575
diff --git a/CHANGES b/CHANGES
index 2356fc9..7c072af 100644
--- a/CHANGES
+++ b/CHANGES
@@ -18,6 +18,8 @@
 - Restored behavior of Cycler for Python 3 users.
 - Subtraction now follows the same behavior as other operators on undefined
   values.
+- `map` and friends will now give better error messages if you forgot to
+  quote the parameter.
 
 Version 2.8.2
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