Fix link to an extension in the GL registry
diff --git a/index.php b/index.php
index 51088ae..9e2dbca 100644
--- a/index.php
+++ b/index.php
@@ -270,7 +270,7 @@
</li>
<li value=101> <a href="extensions/KHR/EGL_KHR_no_config_context.txt">EGL_KHR_no_config_context</a>
</li>
-<li value=102> <a href="../gl/extensions/KHR/context_flush_control.txt">EGL_KHR_context_flush_control</a>
+<li value=102> <a href="https://www.khronos.org/registry/OpenGL/extensions/KHR/KHR_context_flush_control.txt">EGL_KHR_context_flush_control</a>
</li>
<li value=103> <a href="extensions/ARM/EGL_ARM_implicit_external_sync.txt">EGL_ARM_implicit_external_sync</a>
</li>
