> ## Documentation Index > Fetch the complete documentation index at: https://docs.hedera.com/llms.txt > Use this file to discover all available pages before exploring further. # ConsensusSubmitMessage ## ConsensusMessageChunkInfo | Field | Type | Description | | ---------------------- | -------------------------------------------------------------- | ------------------------------------------------------------------------------------------------ | | `initialTransactionID` | [TransactionID](/reference/protobuf/basic-types/transactionid) | TransactionID of the first chunk, gets copied to every subsequent chunk in a fragmented message. | | `total` | int32 | The total number of chunks in the message. | | `number` | int32 | The sequence number (from 1 to total) of the current chunk in the message. | ## ConsensusSubmitMessageTransactionBody | Field | Type | Description | | ----------- | ------------------------------------------------------- | -------------------------------------------------------------------- | | `topicID` | [TopicID](/reference/protobuf/basic-types/topicid) | Topic to submit message to. | | `message` | bytes | Message to be submitted. Max size of a message is 1024 bytes (1 kb). | | `chunkInfo` | [ConsensusMessageChunkInfo](#consensusmessagechunkinfo) | Optional information of the current chunk in a fragmented message. | 🚨 **NOTE:** Max size of a transaction (including messages and signatures) is 6kb.