diff --git a/.rvmrc b/.rvmrc
index 64663b3ba..740fab2e2 100644
--- a/.rvmrc
+++ b/.rvmrc
@@ -1 +1,6 @@
-rvm use 1.9.3
\ No newline at end of file
+# Guarantee correct Ruby/Jekyll compatibility, for RVM users.
+# If you don't specify using > 1.9.3 globally with RVM, jekyll
+# commands don't work until you first type:
+# rvm use 1.9.3
+# Having the .rvmrc file just does this for you.
+rvm use 1.9.3