diff --git a/docs/credential-helpers.md b/docs/credential-helpers.md
index 1722906..165a9cd 100644
--- a/docs/credential-helpers.md
+++ b/docs/credential-helpers.md
@@ -45,7 +45,7 @@ volumes:
   helper: {}
 ```
 
-and for `.docker/config.yml`:
+and for `.docker/config.json`:
 ```yaml
   {
     "HttpHeaders" : {
@@ -61,4 +61,4 @@ and for `.docker/config.yml`:
       "index.docker.io": "osxkeychain" // ...or your prefered helper 
     }
   }
-```
\ No newline at end of file
+```