diff --git a/terrain/Terrain+Editing.cs b/terrain/Terrain+Editing.cs
index 8c47f2c..d4bb633 100644
--- a/terrain/Terrain+Editing.cs
+++ b/terrain/Terrain+Editing.cs
@@ -25,7 +25,7 @@ public partial class Terrain
 			if (!pressed) return;
 
 			const float AdjustHeight = 0.5f;
-			var value = (wheel == MouseButton.WheelUp)
+			var amount = (wheel == MouseButton.WheelUp)
 				? AdjustHeight : -AdjustHeight;
 
 			var selection = TileRegion.From(_selection.Value);
@@ -41,7 +41,7 @@ public partial class Terrain
 				var outerHeight = GetCornerHeights(outerPos)[outerCorner];
 
 				if (IsEqualApprox(outerHeight, innerHeight))
-					SetCornerHeight(outerPos, outerCorner, innerHeight + value);
+					SetCornerHeight(outerPos, outerCorner, innerHeight + amount);
 			}
 
 			// Raise connected sides.
@@ -58,12 +58,13 @@ public partial class Terrain
 					var current = outerHeights;
 					var changed = false;
 
-					foreach (var (innerCorner, outerCorner) in new[]{ (innerCorner1, outerCorner1), (innerCorner2, outerCorner2) }) {
+					var matchingCorners = new[]{ (innerCorner1, outerCorner1), (innerCorner2, outerCorner2) };
+					foreach (var (innerCorner, outerCorner) in matchingCorners) {
 						var innerHeight = innerHeights[innerCorner];
 						var outerHeight = outerHeights[outerCorner];
 
 						if (IsEqualApprox(outerHeight, innerHeight)) {
-							current = current.With(outerCorner, innerHeight + value);
+							current = current.With(outerCorner, innerHeight + amount);
 							changed = true;
 						}
 					}
@@ -74,7 +75,7 @@ public partial class Terrain
 
 			// Raise selected tiles themselves.
 			foreach (var tile in selection.GetAllTiles())
-				AdjustTileHeight(tile, value);
+				AdjustTileHeight(tile, amount);
 
 			UpdateMeshAndShape();
 			NotifyPropertyListChanged();