diff --git a/draw.cpp b/draw.cpp
index 1721a35..13f85a1 100644
--- a/draw.cpp
+++ b/draw.cpp
@@ -908,7 +908,8 @@ void GraphicsWindow::Paint(int w, int h) {
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glEnable(GL_BLEND);
     glEnable(GL_LINE_SMOOTH);
-    glEnable(GL_POLYGON_SMOOTH);
+    // don't enable GL_POLYGON_SMOOTH; that looks ugly on some graphics cards,
+    // drawn with leaks in the mesh
     glEnable(GL_POLYGON_OFFSET_LINE);
     glEnable(GL_POLYGON_OFFSET_FILL);
     glEnable(GL_DEPTH_TEST);