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diff --git a/doc/minetest.6 b/doc/minetest.6
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@@ -83,6 +83,12 @@ Set world path
Migrate from current map backend to another. Possible values are sqlite3
and leveldb. Only works when using --server.
+.SH ENVIRONMENT VARIABLES
+
+.TP
+MINETEST_SUBGAME_PATH
+Colon delimited list of directories to search for subgames.
+
.SH BUGS
Please report all bugs to Perttu Ahola <celeron55@gmail.com>.