diff --git a/cmd-split-window.c b/cmd-split-window.c
index 0aa30ec37..f91e2f35a 100644
--- a/cmd-split-window.c
+++ b/cmd-split-window.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-split-window.c,v 1.155 2026/10/16 07:59:06 nicm Exp $ */
+/* $OpenBSD: cmd-split-window.c,v 1.156 2026/10/16 08:11:03 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -42,7 +42,7 @@ const struct cmd_entry cmd_new_pane_entry = {
 	.alias = "newp",
 
 	.args = { "AbB:Cc:Dde:EfF:hIkl:KLMm:Op:PR:s:S:t:T:vWx:X:y:Y:Z", 0, -1, NULL },
-	.usage = "[-AbCDefhIkKLMOPvWZ] [-B border-lines] "
+	.usage = "[-AbCDdEfhIkKLMOPvWZ] [-B border-lines] "
 		 "[-c start-directory] [-e environment] "
 		 "[-F format] [-l size] [-m message] [-p percentage] "
 		 "[-s style] [-S active-border-style] "
@@ -62,7 +62,7 @@ const struct cmd_entry cmd_split_window_entry = {
 	.alias = "splitw",
 
 	.args = { "bB:c:de:EfF:hIkl:m:p:PR:s:S:t:T:vWZ", 0, -1, NULL },
-	.usage = "[-bdefhIklPvWZ] [-B border-lines] [-c start-directory] "
+	.usage = "[-bdEfhIkPvWZ] [-B border-lines] [-c start-directory] "
 		 "[-e environment] [-F format] [-l size] [-m message] "
 		 "[-p percentage] [-s style] [-S active-border-style] "
 		 "[-R inactive-border-style] [-T title] "
diff --git a/tmux.1 b/tmux.1
index 9d641a70c..5bd5ed591 100644
--- a/tmux.1
+++ b/tmux.1
@@ -1,4 +1,4 @@
-.\" $OpenBSD: tmux.1,v 1.1188 2026/10/16 07:59:06 nicm Exp $
+.\" $OpenBSD: tmux.1,v 1.1189 2026/10/16 08:11:03 nicm Exp $
 .\"
 .\" Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 .\"
@@ -3765,7 +3765,7 @@ but a different format may be specified with
 .Fl F .
 .Tg newp
 .It Xo Ic new\-pane
-.Op Fl AbCDefhIkKLMOPvWZ
+.Op Fl AbCDdEfhIkKLMOPvWZ
 .Op Fl B Ar border\-lines
 .Op Fl c Ar start\-directory
 .Op Fl e Ar environment
@@ -4189,7 +4189,7 @@ the command behaves like
 .Ic last\-window .
 .Tg splitw
 .It Xo Ic split\-window
-.Op Fl bdefhIkPvZ
+.Op Fl bdEfhIkPvWZ
 .Op Fl B Ar border\-lines
 .Op Fl c Ar start\-directory
 .Op Fl e Ar environment