(ewoc--node-branch): Add docstring.

diff --git a/lisp/emacs-lisp/ewoc.el b/lisp/emacs-lisp/ewoc.el
index d870929c21a5fea4e394d1b8997451db7bc40126..954a2afd5143a24cb24c889b891487525577c0c4 100644 (file)
--- a/lisp/emacs-lisp/ewoc.el
+++ b/lisp/emacs-lisp/ewoc.el
@@ -138,7 +138,10 @@
            (:constructor ewoc--node-create (start-marker data)))
   left right data start-marker)
 
-(defalias 'ewoc--node-branch 'aref)
+(defalias 'ewoc--node-branch 'aref
+  "Get the left (CHILD=0) or right (CHILD=1) child of the NODE.
+
+\(fn NODE CHILD)")
 
 (defun ewoc--dll-create ()
   "Create an empty doubly linked list."