From cbb0aeef7afc30f16bae03a8f29fffa4895e0c41 Mon Sep 17 00:00:00 2001
From: Simon Smith <me@simonsmith.io>
Date: Tue, 16 Feb 2016 23:49:26 +0000
Subject: [PATCH] Add clarification on Promise usage in transform

---
 README.md | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 17c54638..aebb4ccb 100755
--- a/README.md
+++ b/README.md
@@ -126,9 +126,17 @@ Type: `Function`
 Default: `null`
 
 A function to transform the content of imported files. Take one argument (file
-  content) and should return the modified content or promise with it.
+  content) and should return the modified content or a resolved promise with it.
 `undefined` result will be skipped.
 
+```js
+transform: function(css) {
+  return postcss([somePlugin]).process(css).then(function(result) {
+    return result.css;
+  });
+}
+```
+
 #### `plugins`
 
 Type: `Array`