diff --git a/boa_engine/src/symbol.rs b/boa_engine/src/symbol.rs
index 42e3720be3a..c7e33f9b44e 100644
--- a/boa_engine/src/symbol.rs
+++ b/boa_engine/src/symbol.rs
@@ -126,7 +126,7 @@ impl WellKnown {
 #[derive(Debug, Clone)]
 struct Inner {
     hash: u64,
-    // must be a `Vec`, since this needs to be shareable between many threads.
+    // must be a `Box`, since this needs to be shareable between many threads.
     description: Option<Box<[u16]>>,
 }