1 files changed, 4 insertions, 1 deletions

diff --git a/src/xfns.c b/src/xfns.c
index 0b1a492a758..f970ea47c60 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -10892,7 +10892,10 @@ displayed at the mouse position, with offset DX added (default is 5 if\n\
 DX isn't specified).  Likewise for the y-position; if a `top' frame\n\
 parameter is specified, it determines the y-position of the tooltip\n\
 window, otherwise it is displayed at the mouse position, with offset\n\
-DY added (default is -10).")
+DY added (default is -10).\n\
+\n\
+A tooltip's maximum size is specified by `x-max-tooltip-size'.\n\
+Text larger than the specified size is clipped.")
   (string, frame, parms, timeout, dx, dy)
      Lisp_Object string, frame, parms, timeout, dx, dy;
 {