diff --git a/docs/engine.md b/docs/engine.md
index b944adc..7b65643 100644
--- a/docs/engine.md
+++ b/docs/engine.md
@@ -236,7 +236,7 @@ engine.addOperatorDecorator('caseInsensitive', (factValue, jsonValue, next) => {
   return next(factValue.toLowerCase(), jsonValue.toLowerCase())
 })
 
-engine.removeOperator('first');
+engine.removeOperatorDecorator('first');
 ```
 
 ### engine.setCondition(String name, Object conditions)