diff --git a/substrate/primitives/state-machine/src/overlayed_changes/mod.rs b/substrate/primitives/state-machine/src/overlayed_changes/mod.rs
index 89bbb063ef..d75feec0ce 100644
--- a/substrate/primitives/state-machine/src/overlayed_changes/mod.rs
+++ b/substrate/primitives/state-machine/src/overlayed_changes/mod.rs
@@ -104,7 +104,7 @@ pub struct OverlayedChanges {
 	stats: StateMachineStats,
 }
 
-/// Transcation index operation.
+/// Transaction index operation.
 #[derive(Debug, Clone)]
 pub enum IndexOperation {
 	/// Insert transaction into index.