(Major Mode Conventions): Explain customizing ElDoc mode.

diff --git a/lispref/modes.texi b/lispref/modes.texi
index 6087d7f89ae7712a915d628ee944d3b90355fc9f..4c7d1130267b3a93abe397b5c83eb73a4ba03855 100644 (file)
--- a/lispref/modes.texi
+++ b/lispref/modes.texi
@@ -254,6 +254,11 @@ variable @code{imenu-generic-expression}, for the pair of variables
 @code{imenu-extract-index-name-function}, or for the variable
 @code{imenu-create-index-function} (@pxref{Imenu}).
 
+@item
+The mode can specify a local value for
+@code{eldoc-documentation-function} to tell ElDoc mode how to handle
+this mode.
+
 @item
 Use @code{defvar} or @code{defcustom} to set mode-related variables, so
 that they are not reinitialized if they already have a value.  (Such