diff --git a/packages/mermaid/src/docs/syntax/classDiagram.md b/packages/mermaid/src/docs/syntax/classDiagram.md
index 552670d3f..aea3dd174 100644
--- a/packages/mermaid/src/docs/syntax/classDiagram.md
+++ b/packages/mermaid/src/docs/syntax/classDiagram.md
@@ -527,7 +527,7 @@ Beginner's tip—a full example using interactive links in an HTML page:
       +run()
       }
 
-      callback Duck callback "Tooltip"
+      callback Duck "callback" "Tooltip"
       link Zebra "https://www.github.com" "This is a link"
   </pre>