diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb5cd72d..f133ff48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,9 +15,16 @@ You can find its changes [documented below](#0111-2024-09-12).
 
 This release has an [MSRV][] of 1.65.
 
+### Added
+
+- `Stroke` is now `PartialEq`, `StrokeOpts` is now `Clone`, `Copy`, `Debug`, `Eq`, `PartialEq`. ([#379][] by [@waywardmonkeys][])
+- Implement `Sum` for `Vec2`. ([#399][] by [@Philipp-M][])
+- Add triangle shape. ([#350][] by [@juliapaci][])
+
 ### Changed
 
-- `Stroke` is now `PartialEq`, `StrokeOpts` is now `Clone`, `Copy`, `Debug`, `Eq`, `PartialEq`. ([#379] by [@waywardmonkeys])
+- Reduce number of operations in `Triangle::circumscribed_circle`. ([#390][] by [@tomcur][])
+- Numerically approximate ellipse perimeter. ([#383] by [@tomcur][])
 
 ## [0.11.1][] (2024-09-12)
 
@@ -25,28 +32,28 @@ This release has an [MSRV][] of 1.65.
 
 ### Added
 
-- Add `From (f32, f32)` for `Point`. ([#339] by [@rsheeter])
-- Add `Rect::overlaps` and `Rect::contains_rect`. ([#347] by [@nils-mathieu])
-- Add `CubicBez::tangents` ([#288] by [@raphlinus])
-- Add `Arc::reversed`. ([#367] by [@waywardmonkeys])
-- Add `CircleSegment::inner_arc` and `CircleSegment::outer_arc` ([#368] by [@waywardmonkeys])
-- Add `Rect::is_zero_area` and `Size::is_zero_area` and deprecate their `is_empty` methods. ([#370] by [@waywardmonkeys])
-- Add `Line::reversed` and `Line::midpoint`. ([#375] by [@waywardmonkeys])
-- Allow construction of `Line` from `(Point, Point)` and `(Point, Vec2)`. ([#376] by [@waywardmonkeys])
+- Add `From (f32, f32)` for `Point`. ([#339][] by [@rsheeter][])
+- Add `Rect::overlaps` and `Rect::contains_rect`. ([#347][] by [@nils-mathieu][])
+- Add `CubicBez::tangents` ([#288][] by [@raphlinus][])
+- Add `Arc::reversed`. ([#367][] by [@waywardmonkeys][])
+- Add `CircleSegment::inner_arc` and `CircleSegment::outer_arc` ([#368][] by [@waywardmonkeys][])
+- Add `Rect::is_zero_area` and `Size::is_zero_area` and deprecate their `is_empty` methods. ([#370][] by [@waywardmonkeys][])
+- Add `Line::reversed` and `Line::midpoint`. ([#375][] by [@waywardmonkeys][])
+- Allow construction of `Line` from `(Point, Point)` and `(Point, Vec2)`. ([#376][] by [@waywardmonkeys][])
 
 ### Changed
 
-- Move `Self: Sized` bound from `Shape` to methods. ([#340] by [@waywardmonkeys])
-- Enable partial SVG path support in `no_std` builds. ([#356] by [@waywardmonkeys])
-- Deprecate `BezPath::flatten`, prefer `flatten`. ([#361] by [@waywardmonkeys])
+- Move `Self: Sized` bound from `Shape` to methods. ([#340][] by [@waywardmonkeys][])
+- Enable partial SVG path support in `no_std` builds. ([#356][] by [@waywardmonkeys][])
+- Deprecate `BezPath::flatten`, prefer `flatten`. ([#361][] by [@waywardmonkeys][])
 
 ### Fixed
 
-- An edge case in `mindist` was fixed. ([#334] by [@platlas])
-- Allow lines in simplify input. ([#343] by [@raphlinus])
-- Don't skip first dash in dash pattern. ([#353] by [@dominikh])
-- Documentation for `Arc.perimeter` was corrected. ([#354] by [@simoncozens])
-- Parsing scientific notation in an SVG path was fixed. ([#365] by [@GabrielDertoni])
+- An edge case in `mindist` was fixed. ([#334][] by [@platlas][])
+- Allow lines in simplify input. ([#343][] by [@raphlinus][])
+- Don't skip first dash in dash pattern. ([#353][] by [@dominikh][])
+- Documentation for `Arc.perimeter` was corrected. ([#354][] by [@simoncozens][])
+- Parsing scientific notation in an SVG path was fixed. ([#365][] by [@GabrielDertoni][])
 
 ## [0.11.0][] (2024-02-14)
 
@@ -56,11 +63,14 @@ Note: A changelog was not kept for or before this release
 
 [@dominikh]: https://github.com/dominikh
 [@GabrielDertoni]: https://github.com/GabrielDertoni
+[@juliapaci]: https://github.com/juliapaci
 [@nils-mathieu]: https://github.com/nils-mathieu
+[@Philipp-M]: https://github.com/Philipp-M
 [@platlas]: https://github.com/platlas
 [@raphlinus]: https://github.com/raphlinus
 [@rsheeter]: https://github.com/rsheeter
 [@simoncozens]: https://github.com/simoncozens
+[@tomcur]: https://github.com/tomcur
 [@waywardmonkeys]: https://github.com/waywardmonkeys
 
 [#288]: https://github.com/linebender/kurbo/pull/288
@@ -69,6 +79,7 @@ Note: A changelog was not kept for or before this release
 [#340]: https://github.com/linebender/kurbo/pull/340
 [#343]: https://github.com/linebender/kurbo/pull/343
 [#347]: https://github.com/linebender/kurbo/pull/347
+[#350]: https://github.com/linebender/kurbo/pull/350
 [#353]: https://github.com/linebender/kurbo/pull/353
 [#354]: https://github.com/linebender/kurbo/pull/354
 [#356]: https://github.com/linebender/kurbo/pull/356
@@ -80,6 +91,10 @@ Note: A changelog was not kept for or before this release
 [#375]: https://github.com/linebender/kurbo/pull/375
 [#376]: https://github.com/linebender/kurbo/pull/376
 [#379]: https://github.com/linebender/kurbo/pull/379
+[#383]: https://github.com/linebender/kurbo/pull/383
+[#388]: https://github.com/linebender/kurbo/pull/388
+[#390]: https://github.com/linebender/kurbo/pull/390
+[#399]: https://github.com/linebender/kurbo/pull/399
 
 [Unreleased]: https://github.com/linebender/kurbo/compare/v0.11.1...HEAD
 [0.11.0]: https://github.com/linebender/kurbo/releases/tag/v0.11.0