diff --git a/Setting-up-the-config-file.md b/Setting-up-the-config-file.md
index e5c0b36..f2781e4 100644
--- a/Setting-up-the-config-file.md
+++ b/Setting-up-the-config-file.md
@@ -7,6 +7,8 @@
 
 ## The config-file ##
 
+**Note: When editing the config-file, you MUST use spaces for indentation! Using tabs instead of spaces will give you errors!**
+
 The config-file consists of 3 sections: **global-settings**, **classes**, and **arenas**. The default config-file that is generated when MobArena is first loaded looks something like this:
 
     [...]
@@ -124,7 +126,7 @@ In the following example, players will receive either four arrows or a gold bar
                 '7': iron_spade, iron_hoe, iron_axe, iron_pickaxe
                 '19': diamond_sword
 
-Note that the wave numbers **must be enclosed by apostrophes (such as `'7': ...`)**, or MobArena will throw YAML-errors.
+Note that the wave numbers **must be enclosed by apostrophes** (e.g. `'7': ...`), or MobArena will throw YAML-errors. If you aren't sure how to do it, just copy one of the other lines and change the wave number and the items.
 
 ### coords ###