diff --git a/protocol-extensions.asciidoc b/protocol-extensions.asciidoc
index 6719f1a52..a7b4b2893 100644
--- a/protocol-extensions.asciidoc
+++ b/protocol-extensions.asciidoc
@@ -154,6 +154,7 @@ The motivation for this extension is the various problems with the existing
 solution for erasing to background color, namely the *background color erase
 (bce)* capability. See
 link:https://github.com/kovidgoyal/kitty/issues/160#issuecomment-346470545[this discussion]
+and link:http://invisible-island.net/ncurses/ncurses.faq.html#bce_mismatches[this FAQ]
 for a summary of problems with *bce*.
 
 For example, to set the background color to blue in a