diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..d5214b7
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,3 @@
+## 2.0-1 ##
+* Change syntax for declaring Systems to be more flexible.
+* Implement Interval Systems, which update on a uniform timed interval.