diff --git a/service/meta.proto b/service/meta.proto
index 62866d20..d3c3005e 100644
--- a/service/meta.proto
+++ b/service/meta.proto
@@ -6,8 +6,14 @@ import "github.com/gogo/protobuf/gogoproto/gogo.proto";
 
 option (gogoproto.stable_marshaler_all) = true;
 
+// RequestMetaHeader contains information about request meta headers
+// (should be embedded into message)
 message RequestMetaHeader {
+    // TTL must be larger than zero, it decreased in every NeoFS Node
     uint32 TTL     = 1;
+    // Epoch for user can be empty, because node sets epoch to the actual value
     uint64 Epoch   = 2;
+    // Version defines protocol version
+    // TODO: not used for now, should be implemented in future
     uint32 Version = 3;
 }
diff --git a/service/verify.proto b/service/verify.proto
index 7d833089..c70015b6 100644
--- a/service/verify.proto
+++ b/service/verify.proto
@@ -6,15 +6,25 @@ import "github.com/gogo/protobuf/gogoproto/gogo.proto";
 
 option (gogoproto.stable_marshaler_all) = true;
 
+// RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request
+// (should be embedded into message).
 message RequestVerificationHeader {
     message Sign {
+        // Sign is signature of the request or session key.
         bytes Sign = 1;
+        // Peer is compressed public key used for signature.
         bytes Peer = 2;
     }
+
     message Signature {
+        // Sign is a signature and public key of the request.
         Sign Sign   = 1 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
+        // Origin used for requests, when trusted node changes it and re-sign with session key.
+        // If session key used for signature request, then Origin should contain
+        // public key of user and signed session key.
         Sign Origin = 2;
     }
 
+    // Signatures is a set of signatures of every passed NeoFS Node
     repeated Signature Signatures = 1;
 }