diff --git a/rust-runner/src/runtime.rs b/rust-runner/src/runtime.rs
index 9f751c2..876d96b 100644
--- a/rust-runner/src/runtime.rs
+++ b/rust-runner/src/runtime.rs
@@ -69,6 +69,8 @@ impl Runtime {
         let val = StorageValue::from_mem(self.memory.get(val_ptr as u32, 32)?)
             .map_err(|_| interpreter::Error::Trap("Memory access violation".to_owned()))?;
 
+        println!("write storage {:?} = {:?}", key, val);
+
         self.storage.insert(key, val);
 
         Ok(Some(0i32.into()))