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-rw-r--r--src/bootstrap/bin/rustc.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/bootstrap/bin/rustc.rs b/src/bootstrap/bin/rustc.rs
index 07a05aeae5d..344eb789ff6 100644
--- a/src/bootstrap/bin/rustc.rs
+++ b/src/bootstrap/bin/rustc.rs
@@ -253,6 +253,8 @@ fn main() {
 
         // When running miri tests, we need to generate MIR for all libraries
         if env::var("TEST_MIRI").ok().map_or(false, |val| val == "true") {
+            // The flags here should be kept in sync with `add_miri_default_args`
+            // in miri's `src/lib.rs`.
             cmd.arg("-Zalways-encode-mir");
             // These options are preferred by miri, to be able to perform better validation,
             // but the bootstrap compiler might not understand them.