diff --git a/mappings/net/minecraft/world/biome/BuiltinBiomes.mapping b/mappings/net/minecraft/world/biome/BuiltinBiomes.mapping
index f5adf3939a..b3245dfb2f 100644
--- a/mappings/net/minecraft/world/biome/BuiltinBiomes.mapping
+++ b/mappings/net/minecraft/world/biome/BuiltinBiomes.mapping
@@ -1,3 +1,7 @@
 CLASS net/minecraft/class_5504 net/minecraft/world/biome/BuiltinBiomes
 	METHOD method_40363 bootstrap (Lnet/minecraft/class_7891;)V
 		ARG 0 biomeRegisterable
+	METHOD method_59880 (Lnet/minecraft/class_5483$class_5496;)V
+		ARG 0 builder
+	METHOD method_59881 (Lnet/minecraft/class_5483$class_5496;)V
+		ARG 0 builder
diff --git a/mappings/net/minecraft/world/biome/OneTwentyOneBiomes.mapping b/mappings/net/minecraft/world/biome/OneTwentyOneBiomes.mapping
new file mode 100644
index 0000000000..14d141447a
--- /dev/null
+++ b/mappings/net/minecraft/world/biome/OneTwentyOneBiomes.mapping
@@ -0,0 +1,7 @@
+CLASS net/minecraft/class_9686 net/minecraft/world/biome/OneTwentyOneBiomes
+	METHOD method_59882 (Lnet/minecraft/class_5483$class_1964;Lnet/minecraft/class_5483$class_5496;)V
+		ARG 1 builder
+	METHOD method_59883 bootstrap (Lnet/minecraft/class_7891;)V
+		ARG 0 biomeRegisterable
+	METHOD method_59884 (Lnet/minecraft/class_5483$class_1964;Lnet/minecraft/class_5483$class_5496;)V
+		ARG 1 builder
diff --git a/mappings/net/minecraft/world/biome/OverworldBiomeCreator.mapping b/mappings/net/minecraft/world/biome/OverworldBiomeCreator.mapping
index a44fbee070..d71a4ad015 100644
--- a/mappings/net/minecraft/world/biome/OverworldBiomeCreator.mapping
+++ b/mappings/net/minecraft/world/biome/OverworldBiomeCreator.mapping
@@ -85,6 +85,7 @@ CLASS net/minecraft/class_5478 net/minecraft/world/biome/OverworldBiomeCreator
 	METHOD method_30708 createSwamp (Lnet/minecraft/class_7871;Lnet/minecraft/class_7871;Ljava/util/function/Consumer;)Lnet/minecraft/class_1959;
 		ARG 0 featureLookup
 		ARG 1 carverLookup
+		ARG 2 additionalSpawnsAdder
 	METHOD method_30709 createLukewarmOcean (Lnet/minecraft/class_7871;Lnet/minecraft/class_7871;Z)Lnet/minecraft/class_1959;
 		ARG 0 featureLookup
 		ARG 1 carverLookup
@@ -158,3 +159,4 @@ CLASS net/minecraft/class_5478 net/minecraft/world/biome/OverworldBiomeCreator
 	METHOD method_43232 createMangroveSwamp (Lnet/minecraft/class_7871;Lnet/minecraft/class_7871;Ljava/util/function/Consumer;)Lnet/minecraft/class_1959;
 		ARG 0 featureLookup
 		ARG 1 carverLookup
+		ARG 2 additionalSpawnsAdder