diff --git a/docs/changelog.md b/docs/changelog.md
index c2d62fe..0617a71 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -14,14 +14,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added math functions, distribution types and functions, and tree types and functions to the library. The code is in separate library files (`math.tppl`, `distributions.tppl` and `trees.tppl`) in the `src/lib/` directory.
+- Added diversification model example for the birth-death diffusion (BDD) model, version 2 (analogous to ClaDS2).
+- Added diversification model versions with hard-coded delayed sampling.
+- Added constant-rate birth-death (CRBD) model using weights based on analytical likelihood rather than simulation.
+
 ### Changed
 
+- Moved the functions `exp`, `log`, `sqrt`, `minInt`, `maxInt`, `floor`, `ceil`, `round` from the `standard.tppl` library file to `math.tppl`.
+
 ### Deprecated
 
 ### Removed
 
+- Removed the `Tree` type from the `standard.tppl` library file. An identical type, called `ClockTree`, is now in the `trees.tppl` library file. This change allows a more convenient interface, in that a user can synonymize a local custom `Tree` type with `ClockTree`, or any other tree type in the standard library that is appropriate for the model script.
+
 ### Fixed
 
+- Changed the `rho` parameter (leaf sampling probability) in the data files for the diversification model scripts from `2.0` to `0.5`.
+
 ### Security
 
 ## v0.3
@@ -44,3 +55,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Using `debug` to print strings no longer crashes
 
 ### Security
+