diff --git a/r.html.markdown b/r.html.markdown
index 2746d1eb..a063cc2f 100644
--- a/r.html.markdown
+++ b/r.html.markdown
@@ -12,7 +12,7 @@ R is a statistical computing language. It has lots of libraries for uploading an
 
 ```r
 
-# Comments start with number symbols.
+# Comments start with hash signs, also known as number symbols (#).
 
 # You can't make multi-line comments,
 # but you can stack multiple comments like so.