diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index 80c38b80e774c..27ab6eac03a5a 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -2103,7 +2103,7 @@ impl<'a> Builder<'a> {
             // during incremental builds" heuristic for the standard library.
             rustflags.arg("-Zinline-mir");
 
-            // always pass this after the next `#[cfg(bootstrap)]` update.
+            // FIXME: always pass this after the next `#[cfg(bootstrap)]` update.
             if compiler.stage != 0 {
                 // Similarly, we need to keep debug info for functions inlined into other std functions,
                 // even if we're not going to output debuginfo for the crate we're currently building,