diff --git a/services/lib/src/GlobalConstants.h b/services/lib/src/GlobalConstants.h
index cb5f2328d..7dbd9394c 100644
--- a/services/lib/src/GlobalConstants.h
+++ b/services/lib/src/GlobalConstants.h
@@ -1,26 +1,28 @@
 #pragma once
 
 #include <string>
 
 namespace comm {
 namespace network {
 
 // 4MB limit
 // WARNING: use keeping in mind that grpc adds its own headers to messages
 // https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
 // so the message that actually is being sent over the network looks like this
 // [Compressed-Flag] [Message-Length] [Message]
 //    [Compressed-Flag]   1 byte  - added by grpc
 //    [Message-Length]    4 bytes - added by grpc
 //    [Message]           N bytes - actual data
 // so for every message we get 5 additional bytes of data
 // as mentioned here
 // https://github.com/grpc/grpc/issues/15734#issuecomment-396962671
 // grpc stream may contain more than one message
 const size_t GRPC_CHUNK_SIZE_LIMIT = 4 * 1024 * 1024;
 const size_t GRPC_METADATA_SIZE_PER_MESSAGE = 5;
 
 const std::string AWS_REGION = "us-east-2";
 
+const std::string ATTACHMENT_DELIMITER = ";";
+
 } // namespace network
 } // namespace comm