diff --git a/cmd-detach-client.c b/cmd-detach-client.c
index 813ac032..f7369df0 100644
--- a/cmd-detach-client.c
+++ b/cmd-detach-client.c
@@ -31,7 +31,7 @@ enum cmd_retval	 cmd_detach_client_exec(struct cmd *, struct cmd_q *);
 const struct cmd_entry cmd_detach_client_entry = {
 	"detach-client", "detach",
 	"as:t:P", 0, 0,
-	"[-P] [-a] [-s target-session] " CMD_TARGET_CLIENT_USAGE,
+	"[-aP] [-s target-session] " CMD_TARGET_CLIENT_USAGE,
 	CMD_READONLY,
 	cmd_detach_client_exec
 };
diff --git a/tmux.1 b/tmux.1
index 3fd383d6..455de33b 100644
--- a/tmux.1
+++ b/tmux.1
@@ -714,8 +714,7 @@ is used,
 .Ic update-environment
 option will not be applied.
 .It Xo Ic detach-client
-.Op Fl P
-.Op Fl a
+.Op Fl aP
 .Op Fl s Ar target-session
 .Op Fl t Ar target-client
 .Xc