diff --git a/src/guide/essentials/watchers.md b/src/guide/essentials/watchers.md
index de1192d91d..826f55236f 100644
--- a/src/guide/essentials/watchers.md
+++ b/src/guide/essentials/watchers.md
@@ -254,7 +254,7 @@ We can force a watcher's callback to be executed immediately by passing the `imm
 
 ```js
 watch(source, (newValue, oldValue) => {
-  // ...
+  // executed immediately, then again when `source` changes
 }, { immediate: true })
 ```