diff --git a/docs/cmdline-opts/tlspassword.d b/docs/cmdline-opts/tlspassword.d
index 5c6a0fa51..e7e37805c 100644
--- a/docs/cmdline-opts/tlspassword.d
+++ b/docs/cmdline-opts/tlspassword.d
@@ -1,4 +1,5 @@
 Long: tlspassword
+Arg: <string>
 Help: TLS password
 Added: 7.21.4
 Category: tls auth
diff --git a/src/tool_help.c b/src/tool_help.c
index 62ebf3417..1fcbc1bc3 100644
--- a/src/tool_help.c
+++ b/src/tool_help.c
@@ -787,7 +787,7 @@ static const struct helptxt helptext[] = {
   {"    --tlsauthtype <type>",
    "TLS authentication type",
    CURLHELP_TLS | CURLHELP_AUTH},
-  {"    --tlspassword",
+  {"    --tlspassword <string>",
    "TLS password",
    CURLHELP_TLS | CURLHELP_AUTH},
   {"    --tlsuser <name>",