diff --git a/README.md b/README.md
index 044264c..76b1ce0 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@
 It consists of several components:
 
 - `src/main.c`, Main script. Takes all other src and actually renders the engine.
+- `src/physics.c`, All the science & math crap. Ugh.
 
 - More stuff in src. README in progress.