diff --git a/Design-Doc%3A-%60level%60-tool.md b/Design-Doc%3A-%60level%60-tool.md
index 7602e5e..dee0f90 100644
--- a/Design-Doc%3A-%60level%60-tool.md
+++ b/Design-Doc%3A-%60level%60-tool.md
@@ -25,10 +25,13 @@ On your object layer in Tiled, you can also use property `reskit-system[x]` to d
 What your game does with this information is entirely up to you: reskit just compiles the information on which entities are where and what components are attached to them. 
 
 ## Configuration TOML
-This is provided on the command line via `-c, --config-file`. This argument is required. The configuration TOML primarily is a mapping of string identifiers to numeric identifiers, which are better suited for use on 8-bit and 16-bit systems. You must define numeric identifiers for each string you use as a `reskit-component[x]`.
+This is provided on the command line via `-c, --config-file`. This argument is required. The configuration TOML primarily is a mapping of string identifiers to numeric identifiers, which are better suited for use on 8-bit and 16-bit systems. You must define numeric identifiers for each string you use as a `reskit-system[x]` or a `reskit-component[x]`.
 
 ### Example
 ```toml
+[systems]
+gameplay = { id = 0 }
+
 [components]
 player = { id = 0 }
 health = {