diff --git a/crates/dbg-swc/src/es/minifier/reduce.rs b/crates/dbg-swc/src/es/minifier/reduce.rs
index a6c35f1a6b0e..1b2cb7d70410 100644
--- a/crates/dbg-swc/src/es/minifier/reduce.rs
+++ b/crates/dbg-swc/src/es/minifier/reduce.rs
@@ -27,6 +27,10 @@ use crate::{
 /// comparison.
 ///
 /// After reducing, the reduced file will be moved to `.swc-reduce` directory.
+///
+///
+/// Note: This tool is not perfect, and it may reduce input file way too much,
+/// or fail to reduce an input file.
 #[derive(Debug, Args)]
 pub struct ReduceCommand {
     /// The path to the input file. You can specify a directory if you want to