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diff --git a/src/xcbxlib.h b/src/xcbxlib.h
index 628d71d..4cb5cd4 100644
--- a/src/xcbxlib.h
+++ b/src/xcbxlib.h
@@ -25,13 +25,17 @@
  * authorization from the authors.
  */
 
+/* This include file declares functions used by Xlib/XCB, but nothing else
+ * should ever use these functions or link to libxcb-xlib. */
+
 #ifndef __XCBXLIB_H
 #define __XCBXLIB_H
 
 #include <pthread.h>
 #include "xcb.h"
 
-/* This function must be called with the IOLock held. */
+/* The caller of this function must hold the xlib lock, using the lock
+ * functions below. */
 unsigned int xcb_get_request_sent(xcb_connection_t *c);
 
 void xcb_xlib_lock(xcb_connection_t *c);