diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index b8d69731054..fa49e5b2593 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -262,8 +262,8 @@ functions (like tan, log, etc). This allows you to get high performance if you
only need (say) 14-bits of precision.
llvm-gcc now supports a C language extension known as "Blocks
-". This feature is similar to nested functions and closures, but does not
+href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2008-August/002670.html">Blocks".
+This feature is similar to nested functions and closures, but does not
require stack trampolines (with most ABIs) and supports returning closures
from functions that define them. Note that actually using Blocks
requires a small runtime that is not included with llvm-gcc.