Rename subsection to include both ARB and KHR extensions
diff --git a/index_gl.php b/index_gl.php
index 26010e2..f7f4457 100644
--- a/index_gl.php
+++ b/index_gl.php
@@ -249,7 +249,7 @@
     today. </p>
 
 <h2> <a name="arbextspecs"></a>
-     ARB Extensions by number</h2>
+     ARB and KHR Extensions by number</h2>
 
 <?php include("extensions/arbext.php"); ?>