Update README.md

brockallen · web-flow · commit ee82b5f78dfa · 2016-08-18T11:52:22.000-04:00
diff --git a/README.md b/README.md
@@ -5,7 +5,7 @@ Also included is support for user session and access token management.
 
 ## Install
 
-##### NPM
+##### NPM (v4.4 or later)
 
 `npm install oidc-client --save`
 
