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-rw-r--r--lisp/emacs-lisp/ewoc.el5
1 files changed, 4 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/ewoc.el b/lisp/emacs-lisp/ewoc.el
index d870929c21a..954a2afd514 100644
--- 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."