diff --git a/docs/content/error/ngPattern/noregexp.ngdoc b/docs/content/error/ngPattern/noregexp.ngdoc
index bc2f56d6ee63..8d1e4c5d623f 100644
--- a/docs/content/error/ngPattern/noregexp.ngdoc
+++ b/docs/content/error/ngPattern/noregexp.ngdoc
@@ -2,3 +2,6 @@
 @name ngPattern:noregexp
 @fullName Expected Regular Expression
 @description
+This error occurs when 'ngPattern' is passed an expression that isn't a regular expression or doesn't have the expected format.
+
+For more information on valid expression syntax, see 'ngPattern' in {@link api/ng.directive:select input} directive docs.