diff --git a/src/NetHack_3.7/src/mklev.c b/src/NetHack_3.7/src/mklev.c
index e70d463..cc7ea5d 100644
--- a/src/NetHack_3.7/src/mklev.c
+++ b/src/NetHack_3.7/src/mklev.c
@@ -56,8 +56,8 @@ mkroom_cmp(const genericptr vx, const genericptr vy)
     x = (const struct mkroom *) vx;
     y = (const struct mkroom *) vy;
     if (x->lx < y->lx)
-        return -1;
-    return (x->lx > y->lx);
+        return -1; // x's lx is less than y's lx
+    return (x->lx > y->lx); // x's lx is greater than y's lx
 }
 
 /* Return TRUE if a door placed at (x, y) which otherwise passes okdoor()
@@ -1896,13 +1896,13 @@ static void
 mksink(struct mkroom *croom)
 {
     coord m;
-
+    // Find a valid position for the sink within the room
     if (!find_okay_roompos(croom, &m))
-        return;
+        return;// No valid position found, return
 
     /* Put a sink at m.x, m.y */
     if (!set_levltyp(m.x, m.y, SINK))
-        return;
+        return;// Failed to set the level type to SINK, return
 
     gl.level.flags.nsinks++;
 }