diff --git a/libpov.js b/libpov.js
index a1cb7e1..add89c9 100644
--- a/libpov.js
+++ b/libpov.js
@@ -427,17 +427,17 @@ function putPointName(context, point) {
 	if (he < limit_heat_min || he > limit_heat_max || hu < limit_humidity_min || hu > limit_humidity_max) {
 		return;
 	}
+	let heat_range = limit_heat_max - limit_heat_min;
+	let humidity_range = limit_humidity_max - limit_humidity_min;
 	let [x, y] = biomeCoordsToCanvasPixelCoords(he, hu);
-	let w = voronoiCanvas.width;
-	let h = voronoiCanvas.height;
-	if (x > w/2) {
+	if (he > (limit_heat_min + heat_range/2)) {
 		context.textAlign = "right";
 		x = x-5;
 	} else {
 		context.textAlign = "left";
 		x = x+5;
 	}
-	if (y < h/2) {
+	if (hu > (limit_humidity_min + humidity_range/2)) {
 		context.textBaseline = "top";
 	} else {
 		context.textBaseline = "alphabetic";