1 files changed, 3 insertions, 0 deletions

diff --git a/doc/lispref/debugging.texi b/doc/lispref/debugging.texi
index 5230854cc7a..87429a67ba9 100644
--- a/doc/lispref/debugging.texi
+++ b/doc/lispref/debugging.texi
@@ -457,6 +457,9 @@ Collapse the top-level Lisp form at point back to a single line.
 @item #
 Toggle @code{print-circle} for the frame at point.
 
+@item .
+Expand all the forms abbreviated with ``...'' in the frame at point.
+
 @end table
 
 @node Debugger Commands