diff --git a/turbopack/crates/turbopack-ecmascript/src/lib.rs b/turbopack/crates/turbopack-ecmascript/src/lib.rs
index cb715f3dedbbd..85c1c86c3d5c2 100644
--- a/turbopack/crates/turbopack-ecmascript/src/lib.rs
+++ b/turbopack/crates/turbopack-ecmascript/src/lib.rs
@@ -146,6 +146,10 @@ pub struct EcmascriptOptions {
     /// The list of export names that should make tree shaking bail off. This is
     /// required because tree shaking can split imports like `export const
     /// runtime = 'edge'` as a separate module.
+    ///
+    /// Currently the analysis of these exports are statically verified by `NextPageStaticInfo`,
+    /// which is a `CustomTransformer` implementation and we don't have a way to apply it after
+    /// tree shaking.
     pub special_exports: Vc<Vec<RcStr>>,
 }