Mention C-/.

1 files changed, 1 insertions, 1 deletions

diff --git a/etc/refcard.tex b/etc/refcard.tex
index c44d43a22a..3b56122a24 100644
--- a/etc/refcard.tex
+++ b/etc/refcard.tex
@@ -311,7 +311,7 @@ the directions.  If you are a first-time user, type \kbd{C-h t} for a
 
 \key{{\bf abort} partially typed or executing command}{C-g}
 \metax{{\bf recover} a file lost by a system crash}{M-x recover-file}
-\key{{\bf undo} an unwanted change}{C-x u {\rm or} C-_}
+\metax{{\bf undo} an unwanted change}{C-x u, C-_ {\rm or} C-/}
 \metax{restore a buffer to its original contents}{M-x revert-buffer}
 \key{redraw garbaged screen}{C-l}