From 87ba279afbc3bf57f7fd508076f377542920ad76 Mon Sep 17 00:00:00 2001
From: Eduardo San Martin Morote <posva13@gmail.com>
Date: Thu, 17 Jan 2019 21:47:50 +0100
Subject: [PATCH] Add comments about $watch behavior with a function

---
 src/v2/api/index.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/v2/api/index.md b/src/v2/api/index.md
index 8c3411c354..77fb63baf3 100644
--- a/src/v2/api/index.md
+++ b/src/v2/api/index.md
@@ -1486,6 +1486,9 @@ type: api
   // function
   vm.$watch(
     function () {
+      // everytime the expression `this.a + this.b` yields a different result,
+      // the handler will be called. It's as if we were watching a computed
+      // property without defining the computed property itself
       return this.a + this.b
     },
     function (newVal, oldVal) {