diff --git a/docs/cmdline-opts/stderr.d b/docs/cmdline-opts/stderr.d
index 6da0401592..1154efb332 100644
--- a/docs/cmdline-opts/stderr.d
+++ b/docs/cmdline-opts/stderr.d
@@ -1,4 +1,5 @@
 Long: stderr
+Arg: <file>
 Help: Where to redirect stderr
 See-also: verbose silent
 Category: verbose
diff --git a/src/tool_help.c b/src/tool_help.c
index 0d1e4cd355..32893547d8 100644
--- a/src/tool_help.c
+++ b/src/tool_help.c
@@ -742,7 +742,7 @@ static const struct helptxt helptext[] = {
   {"-3, --sslv3",
    "Use SSLv3",
    CURLHELP_TLS},
-  {"    --stderr",
+  {"    --stderr <file>",
    "Where to redirect stderr",
    CURLHELP_VERBOSE},
   {"    --styled-output",