diff --git a/compiler/rustc_builtin_macros/src/format/ast.rs b/compiler/rustc_builtin_macros/src/format/ast.rs
index 139645248a1df..01dbffa21b8aa 100644
--- a/compiler/rustc_builtin_macros/src/format/ast.rs
+++ b/compiler/rustc_builtin_macros/src/format/ast.rs
@@ -233,8 +233,8 @@ pub enum FormatAlignment {
 
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum FormatCount {
-    /// `{:0}` or `{:.0}`
+    /// `{:5}` or `{:.5}`
     Literal(usize),
-    /// `{:.*}`, `{:.0$}`, or `{:a$}`, etc.
+    /// `{:.*}`, `{:.5$}`, or `{:a$}`, etc.
     Argument(FormatArgPosition),
 }