diff --git a/pkg/node/peer.go b/pkg/node/peer.go
index 7b79055..cba08f2 100644
--- a/pkg/node/peer.go
+++ b/pkg/node/peer.go
@@ -107,13 +107,13 @@ type PeerRegistry struct {
 	saveStopOnce sync.Once     // Ensure stopChan is closed only once
 }
 
-// Dimension weights for peer selection
-// Lower ping, hops, geographic distance are better; higher score is better
-var (
-	pingWeight        = 1.0
-	hopsWeight        = 0.7
-	geographicWeight  = 0.2
-	scoreWeight       = 1.2
+// Dimension weights for peer selection.
+// Lower ping, hops, geographic distance are better; higher score is better.
+const (
+	pingWeight       = 1.0
+	hopsWeight       = 0.7
+	geographicWeight = 0.2
+	scoreWeight      = 1.2
 )
 
 // NewPeerRegistry creates a new PeerRegistry, loading existing peers if available.