diff --git a/mappings/net/minecraft/world/PortalUtil.mapping b/mappings/net/minecraft/world/BlockLocating.mapping
similarity index 66%
rename from mappings/net/minecraft/world/PortalUtil.mapping
rename to mappings/net/minecraft/world/BlockLocating.mapping
index 8317dd100f..b5c374ece9 100644
--- a/mappings/net/minecraft/world/PortalUtil.mapping
+++ b/mappings/net/minecraft/world/BlockLocating.mapping
@@ -1,4 +1,5 @@
-CLASS net/minecraft/class_5459 net/minecraft/world/PortalUtil
+CLASS net/minecraft/class_5459 net/minecraft/world/BlockLocating
+	COMMENT A few utilities to find block positions matching certain conditions.
 	METHOD method_30574 getLargestRectangle (Lnet/minecraft/class_2338;Lnet/minecraft/class_2350$class_2351;ILnet/minecraft/class_2350$class_2351;ILjava/util/function/Predicate;)Lnet/minecraft/class_5459$class_5460;
 		COMMENT Gets the largest rectangle of blocks along two axes for which all blocks meet a predicate.
 		COMMENT Used for getting rectangles of Nether portal blocks.
@@ -7,7 +8,11 @@ CLASS net/minecraft/class_5459 net/minecraft/world/PortalUtil
 		ARG 2 primaryMaxBlocks
 		ARG 3 secondaryAxis
 		ARG 4 secondaryMaxBlocks
+		ARG 5 predicate
 	METHOD method_30575 moveWhile (Ljava/util/function/Predicate;Lnet/minecraft/class_2338$class_2339;Lnet/minecraft/class_2350;I)I
+		ARG 0 predicate
+		ARG 1 pos
+		ARG 2 direction
 		ARG 3 max
 	METHOD method_30576 findLargestRectangle ([I)Lcom/mojang/datafixers/util/Pair;
 		COMMENT Finds the largest rectangle within a histogram, where the vertical bars each have
@@ -30,6 +35,23 @@ CLASS net/minecraft/class_5459 net/minecraft/world/PortalUtil
 		COMMENT Rectangle in Histogram - LeetCode</a>
 		ARG 0 heights
 			COMMENT the heights of bars in the histogram
+	METHOD method_34851 findColumnEnd (Lnet/minecraft/class_1922;Lnet/minecraft/class_2338;Lnet/minecraft/class_2248;Lnet/minecraft/class_2350;Lnet/minecraft/class_2248;)Ljava/util/Optional;
+		COMMENT Finds an end to a block column starting from {@code pos} extending in {@code
+		COMMENT direction}. Within the column, the block states must be of {@code intermediateBlock}
+		COMMENT and the ending block state, whose position is returned, must be of {@code endBlock}.
+		COMMENT
+		COMMENT @return the end position of the block column where a {@code endBlock} lays, or
+		COMMENT an empty optional if no such column exists
+		ARG 0 world
+			COMMENT the world the column is in
+		ARG 1 pos
+			COMMENT the starting position of the column
+		ARG 2 intermediateBlock
+			COMMENT the blocks that the column must be of, excluding the end
+		ARG 3 direction
+			COMMENT the direction which the column extends to
+		ARG 4 endBlock
+			COMMENT the ending block of the column
 	CLASS class_5460 Rectangle
 		FIELD field_25936 lowerLeft Lnet/minecraft/class_2338;
 		FIELD field_25937 width I