diff --git a/linera-chain/src/block.rs b/linera-chain/src/block.rs
index f77969410ca4..96103b3340b5 100644
--- a/linera-chain/src/block.rs
+++ b/linera-chain/src/block.rs
@@ -208,6 +208,10 @@ pub enum ConversionError {
 }
 
 /// Block defines the atomic unit of growth of the Linera chain.
+/// As part of the block body, contains all the incoming messages 
+/// and operations to executed which define state transition of the chain.
+/// Resulting messages produced by the operations are also included in the block body, 
+/// together with oracle responses and events.
 #[derive(Debug, PartialEq, Eq, Hash, Clone, SimpleObject)]
 pub struct Block {
     /// Header of the block containing metadata of the block.