diff --git a/cmd-split-window.c b/cmd-split-window.c
index 046dc66e..0cd6d8da 100644
--- a/cmd-split-window.c
+++ b/cmd-split-window.c
@@ -43,7 +43,7 @@ const struct cmd_entry cmd_new_pane_entry = {
 		 "[-F format] [-l size] [-m message] [-M mode] "
 		 "[-R inactive-border-style] [-s style] "
 		 "[-S active-border-style] [-x width] [-X x-position]"
-		 "[-y length] [-Y y-position]" CMD_TARGET_PANE_USAGE
+		 "[-y height] [-Y y-position]" CMD_TARGET_PANE_USAGE
 		 "[shell-command [argument ...]]",
 
 	.target = { 't', CMD_FIND_PANE, 0 },
@@ -61,7 +61,7 @@ const struct cmd_entry cmd_split_window_entry = {
 		 "[-F format] [-l size] [-m message] [-M mode] "
 		 "[-R inactive-border-style] [-s style] "
 		 "[-S active-border-style] [-x width] [-X x-position]"
-		 "[-y length] [-Y y-position]" CMD_TARGET_PANE_USAGE
+		 "[-y height] [-Y y-position]" CMD_TARGET_PANE_USAGE
 		 "[shell-command [argument ...]]",
 
 	.target = { 't', CMD_FIND_PANE, 0 },
diff --git a/tmux.1 b/tmux.1
index 4d462159..764a9f4b 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3337,7 +3337,7 @@ but a different format may be specified with
 .Op Fl t Ar target-pane
 .Op Fl x Ar width
 .Op Fl X Ar x-position
-.Op Fl y Ar length
+.Op Fl y Ar height
 .Op Fl Y Ar y-position
 .Op Ar shell-command Op Ar argument ...
 .Xc