diff --git a/developer-handbook.md b/developer-handbook.md
index 72761911..a6142053 100644
--- a/developer-handbook.md
+++ b/developer-handbook.md
@@ -63,6 +63,13 @@ All components have a platform indicator next to them:
 
 ### GBA
 
+The GBA has two major resources for learning about its hardware:
+
+* [Tonc](https://www.coranac.com/tonc/text/toc.htm) - This is basically a short
+  book on the GBA and low level development.
+* [GBATEK](https://rust-console.github.io/gbatek-gbaonly/) - This is a more
+  concise resource that mostly tells about memory ranges and registers.
+
 #### Graphics
 
 * Background Palette: 256 colors