diff --git a/Changelog.md b/Changelog.md
index db75876..8309ce9 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -6,6 +6,10 @@ Add collision detection with Spheres.
 
 Add some more vector/matrix math stuff.
 
+Replace Mat3 with Mat4.
+
+Replace xyz-axis rotation floats in GenericBox with Mat4.
+
 ## Version 1.0.0
 
 First version of this library.