diff --git a/DOCS/man/input.rst b/DOCS/man/input.rst
index 920cd0b5ae126..38daba4cdd6b1 100644
--- a/DOCS/man/input.rst
+++ b/DOCS/man/input.rst
@@ -1273,11 +1273,12 @@ Scripting Commands
     This command has a variable number of arguments, and cannot be used with
     named arguments.
 
-``script-binding <name>``
+``script-binding <name> [<arg>]``
     Invoke a script-provided key binding. This can be used to remap key
     bindings provided by external Lua scripts.
 
-    The argument is the name of the binding.
+    ``<name>`` is the name of the binding. ``<arg>`` is a user-provided
+    arbitrary string which can be used to provide extra information.
 
     It can optionally be prefixed with the name of the script, using ``/`` as
     separator, e.g. ``script-binding scriptname/bindingname``. Note that script
@@ -1295,6 +1296,8 @@ Scripting Commands
     5. The text the key would produce, or empty string if not applicable.
     6. The scale of the key, such as the ones produced by ``WHEEL_*`` keys.
        The scale is 1 if the key is nonscalable.
+    7. The user-provided string ``<arg>``, or empty string if the argument is
+       not used.
 
     The 5th argument is only set if no modifiers are present (using the shift
     key with a letter is normally not emitted as having a modifier, and results
diff --git a/player/command.c b/player/command.c
index ee972733d3ae3..9e43c26fdb5f1 100644
--- a/player/command.c
+++ b/player/command.c
@@ -6439,11 +6439,11 @@ static void cmd_script_binding(void *p)
     char *scale_s = mp_format_double(NULL, scale, 6, false, false, false);
 
     for (int i = 0; i < scale_units; i++) {
-        event.num_args = 6;
-        event.args = (const char*[6]){"key-binding", name, state,
+        event.num_args = 7;
+        event.args = (const char*[7]){"key-binding", name, state,
                                       incmd->key_name ? incmd->key_name : "",
                                       incmd->key_text ? incmd->key_text : "",
-                                      scale_s};
+                                      scale_s, cmd->args[1].v.s};
         if (mp_client_send_event_dup(mpctx, target,
                                      MPV_EVENT_CLIENT_MESSAGE, &event) < 0)
         {
@@ -7156,7 +7156,12 @@ const struct mp_cmd_def mp_cmds[] = {
 
     { "ao-reload", cmd_ao_reload },
 
-    { "script-binding", cmd_script_binding, { {"name", OPT_STRING(v.s)} },
+    { "script-binding", cmd_script_binding,
+        {
+            {"name", OPT_STRING(v.s)},
+            {"arg", OPT_STRING(v.s), OPTDEF_STR(""),
+                .flags = MP_CMD_OPT_ARG},
+        },
         .allow_auto_repeat = true, .on_updown = true, .scalable = true },
 
     { "script-message", cmd_script_message, { {"args", OPT_STRING(v.s)} },