diff --git a/Source/ReliabilityLayer.cpp b/Source/ReliabilityLayer.cpp
index 09f24cf63..b1a590b66 100644
--- a/Source/ReliabilityLayer.cpp
+++ b/Source/ReliabilityLayer.cpp
@@ -2573,6 +2573,8 @@ BitSize_t ReliabilityLayer::GetMessageHeaderLengthBits( const InternalPacket *co
 	//	unsigned short s; s = (unsigned short) internalPacket->dataBitLength; bitStream->WriteAlignedVar16((const char*)& s);
 	bitLength += 8*2;
 
+	// When a large packet is of type RELIABLE_SEQUENCED, the byte size can be one byte more than MTU (1501 bytes), which can cause massive network latency.
+	// The change is introduced by observations and experiments, not by understanding of the code.
     if (internalPacket->reliability == RELIABLE_SEQUENCED)
         bitLength += 8 * 1;