diff --git a/changelogs/4.0-snapshot.md b/changelogs/4.0-snapshot.md
index cb253ab09..a9ad15279 100644
--- a/changelogs/4.0-snapshot.md
+++ b/changelogs/4.0-snapshot.md
@@ -699,6 +699,7 @@ This version features substantial changes to the network system, improving coher
   - `Server->isLevelGenerated()` -> `WorldManager->isWorldGenerated()`
   - `Server->isLevelLoaded()` -> `WorldManager->isWorldLoaded()`
   - `Server->loadLevel()` -> `WorldManager->loadWorld()`
+    - `WorldManager->loadWorld()` may convert worlds if requested (the `$autoUpgrade` parameter must be provided).
   - `Server->setAutoSave()` -> `WorldManager->setAutoSave()`
   - `Server->setDefaultLevel()` -> `WorldManager->setDefaultWorld()`
   - `Server->unloadLevel()` -> `WorldManager->unloadWorld()`
@@ -714,6 +715,9 @@ This version features substantial changes to the network system, improving coher
   - `World->unregisterChunkListener()`
 - The following API methods have been removed:
   - `ChunkLoader->getLoaderId()` (now object ID is used)
+  - `ChunkLoader->isLoaderActive()`
+  - `ChunkLoader->getPosition()`
+  - `ChunkLoader->getLevel()`
   - `World->isFullBlock()`
   - `World->getFullBlock()`
   - `World->getBlockIdAt()`
@@ -755,6 +759,8 @@ This version features substantial changes to the network system, improving coher
 - The following API methods have been renamed / moved:
   - `Level->getCollisionCubes()` -> `World->getCollisionBoxes()`
   - `World->getName()` -> `World->getDisplayName()`
+- The following API methods have changed behaviour:
+  - `World->getChunk()` no longer tries to load chunks from disk. If the chunk is not already in memory, null is returned. (This behaviour now properly matches other `ChunkManager` implementations.)
 - Extracted a unit `pocketmine\world\format\io\FastChunkSerializer` from `Chunk`:
   - `Chunk->fastDeserialize()` -> `FastChunkSerializer::deserialize()`
   - `Chunk->fastSerialize()` -> `FastChunkSerializer::serialize()`