diff --git a/lisp/info.el b/lisp/info.el
index c2c393cb243..d151c6365b8 100644
--- a/lisp/info.el
+++ b/lisp/info.el
@@ -5675,7 +5675,9 @@ completion alternatives to currently visited manuals."
 			   (all-completions
 			    ""
 			    (apply-partially #'Info-read-node-name-2
-					     Info-directory-list
+					     (append
+                                              Info-directory-list
+                                              Info-additional-directory-list)
 					     (mapcar #'car Info-suffix-list))))))))
 
 (provide 'info)