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diff --git a/doc/lispref/help.texi b/doc/lispref/help.texi
index a788852de75..1a9eb30fde1 100644
--- a/doc/lispref/help.texi
+++ b/doc/lispref/help.texi
@@ -333,6 +333,13 @@ stands for no text itself. It is used only for a side effect: it
specifies @var{mapvar}'s value as the keymap for any following
@samp{\[@var{command}]} sequences in this documentation string.
+@item \`@var{KEYSEQ}'
+stands for a key sequence @var{KEYSEQ}, which will use the same face
+as a command substitution. This should be used only when a key
+sequence has no corresponding command, for example when it is read
+directly with @code{read-key-sequence}. It must be a valid key
+sequence according to @code{key-valid-p}.
+
@item `
(grave accent) stands for a left quote.
This generates a left single quotation mark, an apostrophe, or a grave