diff --git a/stylecop.ruleset b/stylecop.ruleset
index 5fa47cfc..6d295d29 100644
--- a/stylecop.ruleset
+++ b/stylecop.ruleset
@@ -10,7 +10,7 @@
     <Rule Id="SA1001" Action="Error" /> <!-- Commas must be spaced correctly -->
     <Rule Id="SA1002" Action="None" /> <!-- Semicolons must be spaced correctly -->
     <Rule Id="SA1003" Action="Error" /> <!-- Symbols must be spaced correctly -->
-    <Rule Id="SA1004" Action="None" /> <!-- Documentation lines must begin with single space -->
+    <Rule Id="SA1004" Action="Error" /> <!-- Documentation lines must begin with single space -->
     <Rule Id="SA1005" Action="None" /> <!-- Single line comments must begin with single space -->
     <Rule Id="SA1006" Action="None" /> <!-- Preprocessor keywords must not be preceded by space -->
     <Rule Id="SA1007" Action="None" /> <!-- Operator keyword must be followed by space -->