diff --git a/docs/index-type-operator.md b/docs/index-type-operator.md
index dd8751c..a1d28e9 100644
--- a/docs/index-type-operator.md
+++ b/docs/index-type-operator.md
@@ -20,7 +20,7 @@ local bob: Person = {
   alive = true
 }
 
-local function doSmt(param: typeof(bob["age"])) -- param = string
+local function doSmt(param: typeof(bob["age"])) -- param = number
   -- rest of code
 end