diff --git a/docs/simplesamlphp-authproc.md b/docs/simplesamlphp-authproc.md
index cda0781a4191e50ab8492aad333a53fb5b734470..8671b5fdad3214e3c4fb5de13277d31a06ac8eb5 100644
--- a/docs/simplesamlphp-authproc.md
+++ b/docs/simplesamlphp-authproc.md
@@ -27,7 +27,7 @@ Be aware that Authentication Proccessing Filters do replace some of the previous
 
   * `attributemap`
   * `attributealter`
-  * attribute filter
+  * `attribute filter`
 
 Later in this document, we will desribe in detail the alternative Authentication Proccessing Filters that will replicate these functionalities.