diff --git a/pageserver/src/tenant/storage_layer/split_writer.rs b/pageserver/src/tenant/storage_layer/split_writer.rs
index dc60b3ecd16d3..9ee660100b387 100644
--- a/pageserver/src/tenant/storage_layer/split_writer.rs
+++ b/pageserver/src/tenant/storage_layer/split_writer.rs
@@ -162,7 +162,7 @@ impl SplitImageLayerWriter {
     }
 
     pub fn discard(self) {
-        // do nothing
+        // The drop handler of each `generated_layer_writers` will clean up the `.tmp` files.
     }
 
     #[cfg(test)]