diff --git a/mappings/net/minecraft/class_6557.mapping b/mappings/net/minecraft/class_6557.mapping
deleted file mode 100644
index 8f48eb536b..0000000000
--- a/mappings/net/minecraft/class_6557.mapping
+++ /dev/null
@@ -1,2 +0,0 @@
-CLASS net/minecraft/class_6557
-	METHOD method_32892 getState (I)Lnet/minecraft/class_2680;
diff --git a/mappings/net/minecraft/world/gen/chunk/BlockColumn.mapping b/mappings/net/minecraft/world/gen/chunk/BlockColumn.mapping
new file mode 100644
index 0000000000..a989cbe6fd
--- /dev/null
+++ b/mappings/net/minecraft/world/gen/chunk/BlockColumn.mapping
@@ -0,0 +1,6 @@
+CLASS net/minecraft/class_6557 net/minecraft/world/gen/chunk/BlockColumn
+	METHOD method_32892 getState (I)Lnet/minecraft/class_2680;
+		ARG 1 y
+	METHOD method_38092 setState (ILnet/minecraft/class_2680;)V
+		ARG 1 y
+		ARG 2 state
diff --git a/mappings/net/minecraft/world/gen/surfacebuilder/DefaultSurfaceBuilder.mapping b/mappings/net/minecraft/world/gen/surfacebuilder/DefaultSurfaceBuilder.mapping
index 286b26699a..d12997bed4 100644
--- a/mappings/net/minecraft/world/gen/surfacebuilder/DefaultSurfaceBuilder.mapping
+++ b/mappings/net/minecraft/world/gen/surfacebuilder/DefaultSurfaceBuilder.mapping
@@ -1,6 +1,7 @@
 CLASS net/minecraft/class_3510 net/minecraft/world/gen/surfacebuilder/DefaultSurfaceBuilder
 	METHOD method_15218 generate (Ljava/util/Random;Lnet/minecraft/class_6557;Lnet/minecraft/class_1959;IIIDLnet/minecraft/class_2680;Lnet/minecraft/class_2680;Lnet/minecraft/class_2680;Lnet/minecraft/class_2680;Lnet/minecraft/class_2680;II)V
 		ARG 1 random
+		ARG 2 column
 		ARG 3 biome
 		ARG 4 z
 		ARG 5 z
diff --git a/mappings/net/minecraft/world/gen/surfacebuilder/SurfaceBuilder.mapping b/mappings/net/minecraft/world/gen/surfacebuilder/SurfaceBuilder.mapping
index 733cd268d5..066d4b3058 100644
--- a/mappings/net/minecraft/world/gen/surfacebuilder/SurfaceBuilder.mapping
+++ b/mappings/net/minecraft/world/gen/surfacebuilder/SurfaceBuilder.mapping
@@ -48,8 +48,8 @@ CLASS net/minecraft/class_3523 net/minecraft/world/gen/surfacebuilder/SurfaceBui
 		COMMENT Places the surface blocks for the given column.
 		ARG 1 random
 			COMMENT the Random instance, seeded with a hash of the x and z coordinates
-		ARG 2 chunk
-			COMMENT the current chunk being surface built
+		ARG 2 column
+			COMMENT the current column being surface built
 		ARG 3 biome
 			COMMENT the biome in the column that is being surface built
 		ARG 4 x