diff --git a/crates/storage/src/lazy/mapping.rs b/crates/storage/src/lazy/mapping.rs
index 73e276b0417..342b04a5366 100644
--- a/crates/storage/src/lazy/mapping.rs
+++ b/crates/storage/src/lazy/mapping.rs
@@ -175,7 +175,7 @@ where
             .unwrap_or_else(|error| panic!("Failed to take value in Mapping: {error:?}"))
     }
 
-    /// Get the size of a value stored at `key` in the contract storage.
+    /// Get the size in bytes of a value stored at `key` in the contract storage.
     ///
     /// Returns `None` if no `value` exists at the given `key`.
     #[inline]