diff --git a/Documentation/ApiOverview/Seo/CanonicalApi.rst b/Documentation/ApiOverview/Seo/CanonicalApi.rst
index 40df0f732..22dfabb8f 100644
--- a/Documentation/ApiOverview/Seo/CanonicalApi.rst
+++ b/Documentation/ApiOverview/Seo/CanonicalApi.rst
@@ -19,7 +19,7 @@ cHash.
 .. _canonicalapi-additionalparameters:
 
 Including specific arguments for the URL generation
-====================================================
+===================================================
 
 TYPO3 will building a URI of the current page and append query strings
 which are needed for the cHash calculation (vital arguments to uniquely identify