diff --git a/core/io/vfs.rs b/core/io/vfs.rs
index c2b2d2763..15e5a3853 100644
--- a/core/io/vfs.rs
+++ b/core/io/vfs.rs
@@ -79,7 +79,9 @@ impl VfsMod {
 
 // #Safety:
 // the callback wrapper in the extension library is FnOnce, so we know
-// that the into_raw/from_raw contract will hold
+/// # Safety
+/// the callback wrapper in the extension library is FnOnce, so we know
+/// that the into_raw/from_raw contract will hold
 unsafe extern "C" fn callback_fn(result: i32, ctx: SendPtr) {
     let completion = Completion {
         inner: (Arc::from_raw(ctx.inner().as_ptr() as *mut CompletionInner)),