diff --git a/pkg/netmap/filter.go b/pkg/netmap/filter.go
index 6838802..37b106a 100644
--- a/pkg/netmap/filter.go
+++ b/pkg/netmap/filter.go
@@ -115,9 +115,9 @@ func (c *Context) matchKeyValue(f *Filter, b *Node) bool {
 		var attr uint64
 
 		switch f.Key() {
-		case PriceAttr:
+		case AttrPrice:
 			attr = b.Price
-		case CapacityAttr:
+		case AttrCapacity:
 			attr = b.Capacity
 		default:
 			var err error
diff --git a/pkg/netmap/node_info.go b/pkg/netmap/node_info.go
index a4debbc..90cccfa 100644
--- a/pkg/netmap/node_info.go
+++ b/pkg/netmap/node_info.go
@@ -44,8 +44,13 @@ const (
 
 // Enumeration of well-known attributes.
 const (
-	CapacityAttr = "Capacity"
-	PriceAttr    = "Price"
+	// AttrPrice is a key to the node attribute that indicates the
+	// price in GAS tokens for storing one GB of data during one Epoch.
+	AttrPrice = "Price"
+
+	// AttrCapacity is a key to the node attribute that indicates the
+	// total available disk space in Gigabytes.
+	AttrCapacity = "Capacity"
 )
 
 var _ hrw.Hasher = (*Node)(nil)
@@ -77,9 +82,9 @@ func newNodeV2(index int, ni *NodeInfo) *Node {
 
 	for _, attr := range ni.Attributes() {
 		switch attr.Key() {
-		case CapacityAttr:
+		case AttrCapacity:
 			n.Capacity, _ = strconv.ParseUint(attr.Value(), 10, 64)
-		case PriceAttr:
+		case AttrPrice:
 			n.Price, _ = strconv.ParseUint(attr.Value(), 10, 64)
 		}
 
diff --git a/pkg/netmap/selector_test.go b/pkg/netmap/selector_test.go
index e434821..e8e1f32 100644
--- a/pkg/netmap/selector_test.go
+++ b/pkg/netmap/selector_test.go
@@ -303,15 +303,15 @@ func TestPlacementPolicy_ProcessSelectorsHRW(t *testing.T) {
 
 	// bucket weight order: RU > DE > FR
 	nodes := []NodeInfo{
-		nodeInfoFromAttributes("Country", "Germany", PriceAttr, "2", CapacityAttr, "10000"),
-		nodeInfoFromAttributes("Country", "Germany", PriceAttr, "4", CapacityAttr, "1"),
-		nodeInfoFromAttributes("Country", "France", PriceAttr, "3", CapacityAttr, "10"),
-		nodeInfoFromAttributes("Country", "Russia", PriceAttr, "2", CapacityAttr, "10000"),
-		nodeInfoFromAttributes("Country", "Russia", PriceAttr, "1", CapacityAttr, "10000"),
-		nodeInfoFromAttributes("Country", "Russia", CapacityAttr, "10000"),
-		nodeInfoFromAttributes("Country", "France", PriceAttr, "100", CapacityAttr, "1"),
-		nodeInfoFromAttributes("Country", "France", PriceAttr, "7", CapacityAttr, "10000"),
-		nodeInfoFromAttributes("Country", "Russia", PriceAttr, "2", CapacityAttr, "1"),
+		nodeInfoFromAttributes("Country", "Germany", AttrPrice, "2", AttrCapacity, "10000"),
+		nodeInfoFromAttributes("Country", "Germany", AttrPrice, "4", AttrCapacity, "1"),
+		nodeInfoFromAttributes("Country", "France", AttrPrice, "3", AttrCapacity, "10"),
+		nodeInfoFromAttributes("Country", "Russia", AttrPrice, "2", AttrCapacity, "10000"),
+		nodeInfoFromAttributes("Country", "Russia", AttrPrice, "1", AttrCapacity, "10000"),
+		nodeInfoFromAttributes("Country", "Russia", AttrCapacity, "10000"),
+		nodeInfoFromAttributes("Country", "France", AttrPrice, "100", AttrCapacity, "1"),
+		nodeInfoFromAttributes("Country", "France", AttrPrice, "7", AttrCapacity, "10000"),
+		nodeInfoFromAttributes("Country", "Russia", AttrPrice, "2", AttrCapacity, "1"),
 	}
 	nm, err := NewNetmap(NodesFromInfo(nodes))
 	require.NoError(t, err)