diff --git a/src/lib.rs b/src/lib.rs
index 78481979479a..d2ead2493c04 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -54,8 +54,7 @@ pub use crate::stacked_borrows::{Borrow, Stack, Stacks, BorStackItem};
 /// set per default, for maximal validation power.
 pub fn miri_default_args() -> &'static [&'static str] {
     // The flags here should be kept in sync with what bootstrap adds when `test-miri` is
-    // set, which happens in `bootstrap/bin/rustc.rs` in the rustc sources; and also
-    // kept in sync with `xargo/build.sh` in this repo and `appveyor.yml`.
+    // set, which happens in `bootstrap/bin/rustc.rs` in the rustc sources.
     &["-Zalways-encode-mir", "-Zmir-emit-retag", "-Zmir-opt-level=0"]
 }