diff --git a/docs/developer-guide/plugins-documentation.md b/docs/developer-guide/plugins-documentation.md
index 243f94415f..b3914ede4d 100644
--- a/docs/developer-guide/plugins-documentation.md
+++ b/docs/developer-guide/plugins-documentation.md
@@ -67,7 +67,7 @@ When you have a monitored state, you can use it in configuration properties this
 ```js
 "cfg": {
   ...
-  "myProp": "{mapType === 'openlayers' : 1 : 2}"
+  "myProp": "{mapType === 'openlayers' ? 1 : 2}"
   ...
 }
 ```