diff --git a/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java b/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java
index c0856d9d..f833b8e2 100644
--- a/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java
+++ b/src/main/java/carpet/mixins/ThreadedAnvilChunkStorage_scarpetChunkCreationMixin.java
@@ -72,7 +72,8 @@ public abstract class ThreadedAnvilChunkStorage_scarpetChunkCreationMixin implem
 
     //in method_20617
     //method_19534(Lnet/minecraft/server/world/ChunkHolder;Lnet/minecraft/world/chunk/Chunk;)Ljava/util/concurrent/CompletableFuture;
-    @Inject(method = "method_19534", at = @At(
+    // incmopatibility with optifine makes this mixin fail.
+    @Inject(method = "method_19534", require = 0, at = @At(
             value = "INVOKE",
             target = "Lnet/minecraft/server/world/ThreadedAnvilChunkStorage;convertToFullChunk(Lnet/minecraft/server/world/ChunkHolder;)Ljava/util/concurrent/CompletableFuture;",
             shift = At.Shift.AFTER
diff --git a/src/main/java/carpet/script/CarpetExpression.java b/src/main/java/carpet/script/CarpetExpression.java
index 7d01c39f..660a6f75 100644
--- a/src/main/java/carpet/script/CarpetExpression.java
+++ b/src/main/java/carpet/script/CarpetExpression.java
@@ -4093,8 +4093,9 @@ public class CarpetExpression
      * __on_tick()         // can access blocks and entities in the overworld
      * __on_tick_nether()  // can access blocks and entities in the nether
      * __on_tick_ender()   // can access blocks and entities in the end
-     * __on_chunk_generated(x,z) // called after a chunk is promoted to the full chunk, prodiving lowest x and z coords in the chunk
-     *
+     * __on_chunk_generated(x,z) // called after a chunk is promoted to the full chunk,
+     *                           // prodiving lowest x and z coords in the chunk
+     *                           // event will not work with optifine installed in the game
      * // player specific callbacks
      * __on_player_uses_item(player, item_tuple, hand)  // right click action
      * __on_player_releases_item(player, item_tuple, hand)  // client action (e.g. bow)