Add hint about ores

README.md

@@ -25,6 +25,8 @@ Hallelujah Mountains [maps](https://i.imgur.com/2SkoAyB.png) can be generated by
     * [Jetpack, wings, etc.](https://forum.minetest.net/viewtopic.php?t=11257)
     * Teleporter mods, balloon mods, etc.
 
+**Ores tip:** If you want ores like iron and diamond to be obtainable from island stone, and are playing Minetest Game, you can go into Settings->Advanced Settings->Mods->cloudlands, set the "Altitude of Islands" to be 1300 (or higher), and Enable "Generate ores inside islands". This works because Minetest Game generates the ores in stone above 1025 to ensure they can be found in the mgV7 Floatlands. Ores can be added in other games or at other altitudes by adding adjusted copies of the game's calls to minetest.register_ore().
+
 **Video:** [Minetest Mod Review: Cloudlands](http://www.nathansalapat.com/minetest/cloudlands)
 
 **Forum:** [link](https://forum.minetest.net/viewtopic.php?t=20257)

settingtypes.txt

@@ -7,6 +7,10 @@
 cloudlands_use_lowland_biomes        (Use lowland biomes) bool false
 
 # The average altitude islands are found at
+#
+# In Minetest game, ores like iron and diamond will be generated if the 
+# altitude of islands is set above 1200 and "Generate ores inside islands"
+# is Enabled.
 cloudlands_altitude             (Altitude of islands) int 200
 
 # The rough variance of altitude in islands (plus or minus this value)