diff --git a/README.md b/README.md
index 2120dd8..273ddd8 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,19 @@
-# ti83
+# ti83-sdk
+
+A C programming SDK for the TI-83 calculator. Includes pre-configured build system, startup files and a C library.
+
+## Requirements
+
+- SDCC
+- GNU Make
+- TilEm
+- RabbitSign
+
+You will need to download the following:
+
+- TI83+ ROM.
+- A signing key.
+
+## Status
+
+WIP.
diff --git a/TODO b/TODO
index fbb27cf..43f10d9 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,4 @@
 
-- properly implement ctype.h
-- determine where is the stack
+- DONE: determine where is the stack | at 0xFFE3.
 - heap allocation