diff --git a/examples/01_introduction/04_Null Safety.md b/examples/01_introduction/04_Null Safety.md
index df07a5e..aaa44da 100755
--- a/examples/01_introduction/04_Null Safety.md	
+++ b/examples/01_introduction/04_Null Safety.md	
@@ -23,7 +23,7 @@ fun main() {
         return notNull.length
     }
     
-    strLength(notNull)                                      // 8
+    strLength(neverNull)                                    // 8
     strLength(nullable)                                     // 9
 //sampleEnd
 }