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-rw-r--r--src/bootstrap/src/lib.rs4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index a252aaac97d..10c13fecbf3 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -171,9 +171,11 @@ pub struct Build {
     doc_tests: DocTests,
     verbosity: usize,
 
-    // Targets for which to build
+    /// Build triple for the pre-compiled snapshot compiler.
     build: TargetSelection,
+    /// Which triples to produce a compiler toolchain for.
     hosts: Vec<TargetSelection>,
+    /// Which triples to build libraries (core/alloc/std/test/proc_macro) for.
     targets: Vec<TargetSelection>,
 
     initial_rustc: PathBuf,