diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 0585ce0..11cc772 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1353,6 +1353,9 @@
 	To use the double quote character it must be escaped: "<M-\">".
 	Don't use <Char-xxxx> to get a utf-8 character, use \uxxxx as
 	mentioned above.
+\{xxx}	like \<xxx> but prepends a modifier instead of including it in the
+	character.  E.g. "\<C-w>" is one character 0x17 while "\{C-w}" is four
+	bytes: 3 for the CTRL modifier and then character "W".
 
 Note that "\xff" is stored as the byte 255, which may be invalid in some
 encodings.  Use "\u00ff" to store character 255 according to the current value