diff --git a/netmap/types.proto b/netmap/types.proto
index 49ed573..a068938 100644
--- a/netmap/types.proto
+++ b/netmap/types.proto
@@ -134,6 +134,17 @@ message NodeInfo {
   // `Attribute` is a Key-Value metadata pair. Key name must be a valid UTF-8
   // string. Value can't be empty.
   //
+  // Attributes can be constructed into a chain of attributes: any attribute can
+  // have a parent attribute and a child attribute (except the first and the last
+  // one). A string representation of the chain of attributes in NeoFS Storage
+  // Node configuration uses ":" and "/" symbols, e.g.:
+  //
+  //        `NEOFS_NODE_ATTRIBUTE_1=key1:val1/key2:val2`
+  //
+  // Therefore the string attribute representation in the Node configuration must
+  // use "\:", "\/" and "\\" escaped symbols if any of them appears in an attribute's
+  // key or value.
+  //
   // Node's attributes are mostly used during Storage Policy evaluation to
   // calculate object's placement and find a set of nodes satisfying policy
   // requirements. There are some "well-known" node attributes common to all the