diff --git a/src/input.h b/src/input.h
index 19693eef03724..b6810ee2b4206 100644
--- a/src/input.h
+++ b/src/input.h
@@ -271,7 +271,7 @@ class input_manager
         void wait_for_any_key();
 
         /**
-         * Sets global input polling timeout as appropriate for the current interface system.
+         * Sets global input polling timeout in milliseconds as appropriate for the current interface system.
          * Use `input_context::(re)set_timeout()` when possible so timeout will be properly
          * reset when entering a new input context.
          */
diff --git a/src/input_context.h b/src/input_context.h
index 043560b0400d4..1d374ebd8e88a 100644
--- a/src/input_context.h
+++ b/src/input_context.h
@@ -267,6 +267,7 @@ class input_context
          *
          * If the action is mouse input, returns "MOUSE".
          *
+         * @param timeout in milliseconds.
          * @return One of the input actions formerly registered with
          *         `register_action()`, or "ERROR" if an error happened.
          *
diff --git a/src/main_menu.cpp b/src/main_menu.cpp
index 7645cd5be1bb7..013f6e26b3d57 100644
--- a/src/main_menu.cpp
+++ b/src/main_menu.cpp
@@ -108,7 +108,7 @@ void demo_ui::run()
 
     while( is_open ) {
         ui_manager::redraw();
-        action = ctxt.handle_input();
+        action = ctxt.handle_input( 5 );
         if( action == "QUIT" ) {
             break;
         }