diff --git a/README.md b/README.md
index b2cbf4c..863b410 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,9 @@ or check whether a number is prime in a const function.
 
 `no_std` compatible when the `serde` feature is disabled.
 
+This version supports Rust versions 1.81.0 and up, while previous versions
+support Rust versions 1.67.1 and up.
+
 ## Example: generate primes at compile time and use them for related computations
 
 The struct `Primes` is a wrapper around an array of primes generated by a
diff --git a/src/lib.rs b/src/lib.rs
index 2500171..7a7ce33 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,8 @@
 //! or check whether a number is prime in a const function.
 //!
 //! `no_std` compatible when the `serde` feature is disabled.
+//! 
+//! This version supports Rust versions 1.81.0 and up, while previous versions support Rust versions 1.67.1 and up.
 //!
 //! # Example: generate primes at compile time and  reuse it for related computations
 //!