diff --git a/actix-web/src/app.rs b/actix-web/src/app.rs
index 1a3b79086..3d86d1f9b 100644
--- a/actix-web/src/app.rs
+++ b/actix-web/src/app.rs
@@ -112,8 +112,8 @@ where
     /// })
     /// ```
     #[doc(alias = "manage")]
-    pub fn app_data<U: 'static>(mut self, ext: U) -> Self {
-        self.extensions.insert(ext);
+    pub fn app_data<U: 'static>(mut self, data: U) -> Self {
+        self.extensions.insert(data);
         self
     }