diff --git a/doc/lua_api.md b/doc/lua_api.md
index fc7127973..814eb3ad2 100644
--- a/doc/lua_api.md
+++ b/doc/lua_api.md
@@ -438,7 +438,8 @@ A `Settings` file that provides meta information about the mapgen.
              internal ID used to track versions.
 * `textdomain`: Textdomain used to translate title and description. Defaults to mapgen.
   See [Translating content meta](#translating-content-meta).
-* `mapgen_flags`: List of flags to be used
+* `mg_flags`: List of mg_flags that are allowed
+* `lmg_flags`: List of custom flags, same format as mg_flags
 
 
 Aliases
diff --git a/doc/menu_lua_api.md b/doc/menu_lua_api.md
index 4de77103c..fbfb8eefb 100644
--- a/doc/menu_lua_api.md
+++ b/doc/menu_lua_api.md
@@ -109,7 +109,7 @@ of manually putting one, as different OSs use different delimiters. E.g.
 * `handle:stop()` or `core.sound_stop(handle)`
 * `core.get_mapgen_names([include_hidden=false])` -> table of map generator algorithms
     registered in the core (possible in async calls)
-* `core.get_lua_mapgens()` -> map of `[mapgen_name] = {desc = <mapgen_description>, title = <title>, mapgen_flags = <flags_table>}` as listed
+* `core.get_lua_mapgens()` -> map of `[mapgen_name] = {desc = <mapgen_description>, title = <title>, mg_flags = <allowed mg_flags table format: [key] = true>, lmg_flags = <custom flags in format of mg_flags>}` as listed
     in `mapgen.conf`, and `nil` if they don't exist.
 * `core.get_cache_path()` -> path of cache
 * `core.get_temp_path([param])` (possible in async calls)