diff --git a/README.md b/README.md
index ed29955..8aae3ed 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ in `±1␣023␣Ki`. The plus sign of positive numbers is optional.
 
 ## Usage
 
-This crate works since Rust 1.35 on stable channel. It is
+This crate works since Rust 1.34 on stable channel. It is
 [on crates.io](https://crates.io/crates/signifix) and can be used by adding
 `signifix` to the dependencies in your project's `Cargo.toml`:
 
diff --git a/src/lib.rs b/src/lib.rs
index c73e761..0b3ed91 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -76,7 +76,7 @@
 //!
 //! # Usage
 //!
-//! This crate works since Rust 1.35 on stable channel. It is
+//! This crate works since Rust 1.34 on stable channel. It is
 //! [on crates.io](https://crates.io/crates/signifix) and can be used by adding
 //! `signifix` to the dependencies in your project's `Cargo.toml`:
 //!