diff --git a/Cargo.lock b/Cargo.lock
index d96d9ba5..b005f06b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -52,7 +52,7 @@ checksum = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
 
 [[package]]
 name = "hex-literal"
-version = "0.3.0"
+version = "0.3.1"
 
 [[package]]
 name = "opaque-debug"
diff --git a/hex-literal/CHANGELOG.md b/hex-literal/CHANGELOG.md
index 537e3c19..a590ed5e 100644
--- a/hex-literal/CHANGELOG.md
+++ b/hex-literal/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.3.1 (2020-08-01)
+### Added
+- Documentation for the `hex!` macro ([#73])
+
+[#73]: https://github.com/RustCrypto/utils/pull/73
+
 ## 0.3.0 (2020-07-16)
 ### Changed
 - MSRV bump to 1.45 ([#53])
diff --git a/hex-literal/Cargo.toml b/hex-literal/Cargo.toml
index 7490b784..f991cb0a 100644
--- a/hex-literal/Cargo.toml
+++ b/hex-literal/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hex-literal"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["RustCrypto Developers"]
 license = "MIT OR Apache-2.0"
 description = "Procedural macro for converting hexadecimal string to byte array at compile time."
diff --git a/hex-literal/src/lib.rs b/hex-literal/src/lib.rs
index 52de8ba2..68b6d5cd 100644
--- a/hex-literal/src/lib.rs
+++ b/hex-literal/src/lib.rs
@@ -90,7 +90,7 @@ impl TokenTreeIter {
                 b'A'..=b'F' => v - 55,
                 b'a'..=b'f' => v - 87,
                 b' ' | b'\r' | b'\n' | b'\t' => continue,
-                _ => panic!("invalid character"),
+                _ => panic!("encountered invalid character"),
             };
             return Some(n);
         }
@@ -117,6 +117,8 @@ impl Iterator for TokenTreeIter {
     }
 }
 
+/// Macro for converting string literal containing hex-encoded string
+/// to an array containing decoded bytes
 #[proc_macro]
 pub fn hex(input: TokenStream) -> TokenStream {
     let ts = TokenStream::from_iter(TokenTreeIter::new(input));