Updated to added npm to the text

README.markdown

@@ -76,7 +76,7 @@ In place of a version pointer like "0.10", you can use the special default alias
     nvm use stable
     nvm run unstable --version
 
-If you want to install a new version of Node.js and migrate packages from a previous version:
+If you want to install a new version of Node.js and migrate npm packages from a previous version:
 
     nvm install v0.10.40 --reinstall-packages-from=0.10.39
     nvm install v0.12.7 --reinstall-packages-from=0.12.6