(Deletion): Describe `M-\' prefix argument.

1 files changed, 4 insertions, 3 deletions

diff --git a/man/killing.texi b/man/killing.texi
index 4be77e2d6f8..a612535a74a 100644
--- a/man/killing.texi
+++ b/man/killing.texi
@@ -148,10 +148,11 @@ enters Help instead, see @ref{DEL Does Not Delete}.
   The other delete commands are those which delete only whitespace
 characters: spaces, tabs and newlines.  @kbd{M-\}
 (@code{delete-horizontal-space}) deletes all the spaces and tab
-characters before and after point.  @kbd{M-@key{SPC}}
+characters before and after point.  (With a prefix argument, it
+deletes them before point, but not after.)  @kbd{M-@key{SPC}}
 (@code{just-one-space}) does likewise but leaves a single space after
-point, regardless of the number of spaces that existed previously (even
-if there were none before).  With a numeric argument @var{n}, it
+point, regardless of the number of spaces that existed previously
+(even if there were none before).  With a numeric argument @var{n}, it
 leaves @var{n} spaces after point.
 
   @kbd{C-x C-o} (@code{delete-blank-lines}) deletes all blank lines