name mangling update/fix
diff --git a/docs/mangling.html b/docs/mangling.html
index 3f550ba..5507154 100644
--- a/docs/mangling.html
+++ b/docs/mangling.html
@@ -19,6 +19,10 @@
 <p>
 To do this, recompile Mesa with the compiler flag -DUSE_MGL_NAMESPACE.
 Add the flag to CFLAGS in the configuration file which you want to use.
+For example:
+<pre>
+CFLAGS += -DUSE_MGL_NAMESPACE
+</pre>
 </p>