diff --git a/doc/en/scripting/builtins/libapp.md b/doc/en/scripting/builtins/libapp.md
index 3a8712c7..69a472ee 100644
--- a/doc/en/scripting/builtins/libapp.md
+++ b/doc/en/scripting/builtins/libapp.md
@@ -25,9 +25,12 @@ Waits for the specified time in seconds, performing the main engine loop.
 app.sleep_until(
     -- function that checks the condition for ending the wait
     predicate: function() -> bool,
-    -- the maximum number of engine loop ticks after which
+    -- maximum number of engine loop ticks after which
     -- a "max ticks exceed" exception will be thrown
-    [optional] max_ticks = 1e9
+    [optional] max_ticks = 1e9,
+    -- maximum wait time in seconds.
+    -- (works with system time, including test mode)
+    [optional] timeout = 1e9
 )
 ```
 
diff --git a/doc/ru/scripting/builtins/libapp.md b/doc/ru/scripting/builtins/libapp.md
index eb504d25..4e9493c4 100644
--- a/doc/ru/scripting/builtins/libapp.md
+++ b/doc/ru/scripting/builtins/libapp.md
@@ -27,7 +27,10 @@ app.sleep_until(
     predicate: function() -> bool,
     -- максимальное количество тактов цикла движка, после истечения которых
     -- будет брошено исключение "max ticks exceed"
-    [опционально] max_ticks = 1e9
+    [опционально] max_ticks = 1e9,
+    -- максимальное длительность ожидания в секундах. 
+    -- (работает с системным временем, включая test-режим)
+    [опционально] timeout = 1e9
 )
 ```