diff --git a/changelogs/4.0-snapshot.md b/changelogs/4.0-snapshot.md
index 994eb594e..ddc77f939 100644
--- a/changelogs/4.0-snapshot.md
+++ b/changelogs/4.0-snapshot.md
@@ -42,6 +42,7 @@ This major version features substantial changes throughout the core, including s
 - Timings now use high-resolution timers provided by `hrtime()` to collect more accurate performance metrics.
 - Z-order curves (morton codes) are now used for block and chunk coordinate hashes. This substantially improves performance in many areas by resolving a hashtable key hash collision performance issue. Affected areas include explosions, light calculation, and more.
 - [`libdeflate`](https://github.com/ebiggers/libdeflate) is now (optionally) used for outbound Minecraft packet compression. It's more than twice as fast as zlib in most cases, providing significant performance boosts to packet broadcasts and overall network performance.
+- Closures are now used for internal event handler calls. This provides a performance improvement of 10-20% over the 3.x system, which had to dynamically resolve callables for every event call.
 
 ### Logger revamp
 - Many components now have a dedicated logger which automatically adds [prefixes] to their messages.