diff --git a/os/src/task/mod.rs b/os/src/task/mod.rs
index 0a4f9f5e..297006cb 100644
--- a/os/src/task/mod.rs
+++ b/os/src/task/mod.rs
@@ -161,7 +161,7 @@ fn call_user_signal_handler(sig: usize, signal: SignalFlags) {
         trap_ctx.x[10] = sig;
     } else {
         // default action
-        //println!("[K] task/call_user_signal_handler: default action, kill current process");
+        println!("[K] task/call_user_signal_handler: default action: ignore it or kill process");
     }
 }