[Docs] Added missing piece

This sentence broke my brain when I read it the first time :) I hope this helps.
diff --git a/README.md b/README.md
index 1e1fb69..3d0f07d 100644
--- a/README.md
+++ b/README.md
@@ -325,7 +325,7 @@
 ### .nvmrc
 
 You can create a `.nvmrc` file containing version number in the project root directory (or any parent directory).
-`nvm use`, `nvm install`, `nvm exec`, `nvm run`, and `nvm which` will all respect an `.nvmrc` file when a version is not supplied.
+`nvm use`, `nvm install`, `nvm exec`, `nvm run`, and `nvm which` will all respect an `.nvmrc` file when a version is not supplied on the command line.
 
 For example, to make nvm default to the latest 5.9 release for the current directory: