diff --git a/CHANGES b/CHANGES
index f499e40..a4d8c8e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,3 +2,4 @@ v0.1.0, 1/14/2013 -- Initial release.
 v0.2.0, 1/15/2013 -- Added Classy validator and tests
 v0.2.1, 1/15/2013 -- Fixed validate continuing on a field after failing a Required validation 
 v0.2.2, 1/15/2013 -- Added Pattern regex validator and tests 
+v0.2.3, 1/15/2013 -- Added missing Not(Pattern()) error message 
diff --git a/validator/__init__.py b/validator/__init__.py
index f082e39..1cf0965 100644
--- a/validator/__init__.py
+++ b/validator/__init__.py
@@ -57,6 +57,8 @@ def not_lambda(value):
         not_lambda.err_message = "must not fall between %s and %s" % (validator.start, validator.end)
     elif validator.__name__ == "class_lambda":
         not_lambda.err_message = "must not be an instance of %s or its subclasses" % validator.base_class
+    elif validator.__name__ == "pattern_lambda":
+        not_lambda.err_message = "must not match regex pattern %s" % validator.pattern
 
     return not_lambda