diff --git a/doc/userguide/rules/payload-keywords.rst b/doc/userguide/rules/payload-keywords.rst
index f071c76d81..ad4e5814af 100644
--- a/doc/userguide/rules/payload-keywords.rst
+++ b/doc/userguide/rules/payload-keywords.rst
@@ -291,7 +291,7 @@ Format::
 
   dsize:<number>;
 
-example of dsize in a rule:
+Example of dsize in a rule:
 
 .. container:: example-rule