diff --git a/docs/database/cmulisp-fmt.el b/docs/database/cmulisp-fmt.el
index c936b65e320b750c5baa304e9fdfb1d0387ebfc2..c15ce5c44c986dabd3eb3951b28dcc67bb232018 100644
--- a/docs/database/cmulisp-fmt.el
+++ b/docs/database/cmulisp-fmt.el
@@ -97,6 +97,10 @@
   (latexinfo-parse-noarg)
   )
 
+(put 'hfill 'latexinfo-format 'latexinfo-format-hfill)
+(defun latexinfo-format-hfill ()
+  (latexinfo-parse-noarg))
+
 (put 'hide 'latexinfo-format 'latexinfo-parse-required-argument)
 (put 'ux 'latexinfo-format 'latexinfo-parse-required-argument)