diff --git a/Configuration-of-worlds.md b/Configuration-of-worlds.md
index 927f269..dd3cafe 100644
--- a/Configuration-of-worlds.md
+++ b/Configuration-of-worlds.md
@@ -59,7 +59,8 @@ web:
 Make sure that:
 
 * Your world directories are in the root of `minecraft_server`, for example `minecraft_server/world` and `minecraft_server/nether`.
-* Your world directories do not contain weird characters and only letters, numbers and maybe `_`.
+* Your world directories are places in `minecraft_server` next to `craftbukkit*.jar` and not in a subdirectory.
+* Your world directories do not contain weird characters and only letters, numbers and `_`.
 * The `name` of the world in both the server-side-section and the web-section correctly match the name of your world directory, for example `world` or `nether`. Please note that these names are _case-sensitive_!
 * `defaultmap` matches a name of a map in the web-section. Again note that these names are _case-sensitive_!
 * If you change the `prefix` variable, the prefix in both the server-side section AND the web-section matches.