diff --git a/README.md b/README.md
index 64c5ca4..0fc297c 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,12 @@ The sourcemint `sm` command delivered via [NPM](http://npmjs.org/).
   * Sponsor: [Sourcemint](http://sourcemint.com/)
   * Mailing list: [groups.google.com/group/sourcemint](http://groups.google.com/group/sourcemint)
 
+Requirements
+============
+
+  * [NodeJS](http://nodejs.org) `>= 0.6.15`
+  * [NPM](http://npmjs.org) `>= 1.1.16`
+
 
 Install
 =======
diff --git a/package.json b/package.json
index 54a2e74..e9fa6a1 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,8 @@
     },
     "pm": "npm",
     "engines": {
-        "node": ">= 0.6.15"
+        "node": ">= 0.6.15",
+        "npm": ">= 1.1.16"
     },
     "preferGlobal": true,
     "bin": {