doc/lua_api.md

@@ -5920,7 +5920,7 @@ Environment access
     * `val` is between `0` and `1`; `0` for midnight, `0.5` for midday
 * `minetest.get_timeofday()`
 * `minetest.get_gametime()`: returns the time, in seconds, since the world was
-  created.
+  created. The time is not available (`nil`) before the first server step.
 * `minetest.get_day_count()`: returns number days elapsed since world was
   created.
     * accounts for time changes.