diff --git a/crates/proc-macro-srv/src/abis/abi_1_64/mod.rs b/crates/proc-macro-srv/src/abis/abi_1_64/mod.rs
index 590712fe6945..a5c9a1a976e3 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_64/mod.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_64/mod.rs
@@ -1,4 +1,4 @@
-//! Macro ABI for version 1.63 of rustc
+//! Proc macro ABI.
 
 #[allow(dead_code)]
 #[doc(hidden)]