diff --git a/config.def.h b/config.def.h
index a784eb4..646a3d6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -36,8 +36,10 @@ static const Layout layouts[] = {
 };
 
 /* monitors */
-/* (x=-1, y=-1) is reserved as an "autoconfigure" monitor position indicator */
-/* WARNING: negative values other than (-1, -1) cause problems with xwayland clients' menus */
+/* (x=-1, y=-1) is reserved as an "autoconfigure" monitor position indicator
+ * WARNING: negative values other than (-1, -1) cause problems with Xwayland clients
+ * https://gitlab.freedesktop.org/xorg/xserver/-/issues/899
+*/
 /* NOTE: ALWAYS add a fallback rule, even if you are completely sure it won't be used */
 static const MonitorRule monrules[] = {
 	/* name       mfact  nmaster scale layout       rotate/reflect                x    y */