diff --git a/lib/rvm.zsh b/lib/rvm.zsh
new file mode 100644
index 000000000..d57523e95
--- /dev/null
+++ b/lib/rvm.zsh
@@ -0,0 +1,8 @@
+function rvm_ruby_prompt {
+  if (declare -f rvm > /dev/null) {
+      if [[ -x $MY_RUBY_HOME ]]
+      then ruby -v | sed 's/\([^(]*\).*/\1/'
+      fi
+  }
+}
+