diff --git a/compiler/rustc_builtin_macros/src/format.rs b/compiler/rustc_builtin_macros/src/format.rs
index 63bc0d552c1..b2b7b9d75bd 100644
--- a/compiler/rustc_builtin_macros/src/format.rs
+++ b/compiler/rustc_builtin_macros/src/format.rs
@@ -638,7 +638,7 @@ fn report_missing_placeholders(
                 if show_doc_note {
                     diag.note(concat!(
                         stringify!($kind),
-                        " formatting not supported; see the documentation for `std::fmt`",
+                        " formatting is not supported; see the documentation for `std::fmt`",
                     ));
                 }
                 if suggestions.len() > 0 {