diff --git a/API.md b/API.md
index b0c676a..e721613 100644
--- a/API.md
+++ b/API.md
@@ -102,4 +102,24 @@ but if the difference is smaller than 0, the mana will be set to 0.
 * `false` on failure (mana could not be subtracted)
 
 
+## Appendix
+### General recommendations
+If you want your mod to be portable, it is recommended that you balance your mod in such a way that it assumes
+that every player starts with the following default mana values:
 
+* Max. mana: 200
+* Mana regeneration: 1 mana every 0.2 seconds
+
+Also assume that the max. mana never changes.
+This should (hopefully) ensure that multiple independent mana-using mods are more or less balanced when using
+the default settings.
+
+Also, to make life easier for subgame makers, define custom minetest.conf settings for your mod in order to
+overwrite the mana costs (and other relevant values) used by your mod. That way, subgame makers only have to edit
+minetest.conf, and not your mod.
+
+You do not have to bother about default values if you want to directly integrate your mod in a subgame and do
+not plan to release the mod independently.
+
+The best way to reliable balance the mana values used by several mods is to create a standalone subgame. It is
+highly recommended that you tweak the mana values of the mods to fit the subgame's needs.