diff --git a/netmap/types.proto b/netmap/types.proto
index a068938..a82abe1 100644
--- a/netmap/types.proto
+++ b/netmap/types.proto
@@ -235,4 +235,7 @@ message NetworkInfo {
 
     // Magic number of the sidechain of the NeoFS network.
     uint64 magic_number = 2 [json_name = "magicNumber"];
+
+    // MillisecondsPerBlock network parameter.
+    int64 ms_per_block = 3 [json_name = "msPerBlock"];
 }