Tweaking the readme description

README.markdown

diff --git a/README.markdown b/README.markdown
index e99abfe..03805f8 100644
--- a/README.markdown
+++ b/README.markdown
@@ -52,7 +52,7 @@
 
     nvm run 0.10 --version
 
-Or, you can run any arbitrary command in the node environment:
+Or, you can run any arbitrary command in a subshell with the desired version of node:
 
     nvm exec 0.10 node --version