diff --git a/docs/library/esp.rst b/docs/library/esp.rst
index cb2bc7af8d..b9ae57bd97 100644
--- a/docs/library/esp.rst
+++ b/docs/library/esp.rst
@@ -31,7 +31,7 @@ Functions
 
     The system enters the set sleep mode automatically when possible.
 
-.. function:: deepsleep(time=0, /)
+.. function:: deepsleep(time_us=0, /)
 
     **Note**: ESP8266 only - use `machine.deepsleep()` on ESP32