1 files changed, 2 insertions, 2 deletions
diff --git a/README.md b/README.md
index e73c12f..10e7cc8 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ async.map(['file1','file2','file3'], fs.stat, function(err, results){
 
 async.filter(['file1','file2','file3'], function(filePath, callback) {
   fs.access(filePath, function(err) {
-    callback(!err)
+    callback(null, !err)
   });
 }, function(results){
     // results now equals an array of the existing files
@@ -417,7 +417,7 @@ __Example__
 ```js
 async.filter(['file1','file2','file3'], function(filePath, callback) {
   fs.access(filePath, function(err) {
-    callback(!err)
+    callback(null, !err)
   });
 }, function(results){
     // results now equals an array of the existing files