diff --git a/docs/templates.txt b/docs/templates.txt
index 4a5161eae5..89d9eacda8 100644
--- a/docs/templates.txt
+++ b/docs/templates.txt
@@ -677,7 +677,9 @@ Built-in filter reference
     for an introduction.
 
 ``slugify``
-    Converts to lowercase, removes non-alpha chars and converts spaces to hyphens
+    Converts to lowercase, removes non-word characters (alphanumerics and
+    underscores) and converts spaces to hyphens. Also strips leading and
+    trailing whitespace.
 
 ``stringformat``
     Formats the variable according to the argument, a string formatting specifier.