diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 95abad6..430f9d6 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "00df609016d7e75b3730fcf0cef25fc0efe14204"
+    "sha1": "abf3a15887758e0af54ebca827c7b6f8b311cb45"
   }
 }
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b284608..fc6824a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,6 +55,7 @@
       uses: actions-rs/toolchain@v1
       with:
         toolchain: ${{ matrix.rust }}
+        override: true
         profile: minimal
     - run: cargo build --verbose
     - run: cargo doc --verbose
diff --git a/Cargo.toml b/Cargo.toml
index 313d6f4..49c6662 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@
 [package]
 edition = "2018"
 name = "walkdir"
-version = "2.3.1"
+version = "2.3.2"
 authors = ["Andrew Gallant <jamslam@gmail.com>"]
 exclude = ["/ci/*", "/.travis.yml", "/appveyor.yml"]
 description = "Recursively walk a directory."
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 94fc562..c71c2fe 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "walkdir"
-version = "2.3.1"  #:version
+version = "2.3.2"  #:version
 authors = ["Andrew Gallant <jamslam@gmail.com>"]
 description = "Recursively walk a directory."
 documentation = "https://docs.rs/walkdir/"
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..3b0a5dc
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Andrew Gallant
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/METADATA b/METADATA
index c49f861..42088b4 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/walkdir/walkdir-2.3.1.crate"
+    value: "https://static.crates.io/crates/walkdir/walkdir-2.3.2.crate"
   }
-  version: "2.3.1"
+  version: "2.3.2"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2020
-    month: 12
-    day: 21
+    year: 2021
+    month: 4
+    day: 2
   }
 }
diff --git a/README.md b/README.md
index 2b49506..14bd4a9 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,9 @@
 directory tree.
 
 [![Build status](https://github.com/BurntSushi/walkdir/workflows/ci/badge.svg)](https://github.com/BurntSushi/walkdir/actions)
-[![](http://meritbadge.herokuapp.com/walkdir)](https://crates.io/crates/walkdir)
+[![](https://meritbadge.herokuapp.com/walkdir)](https://crates.io/crates/walkdir)
 
-Dual-licensed under MIT or the [UNLICENSE](http://unlicense.org).
+Dual-licensed under MIT or the [UNLICENSE](https://unlicense.org/).
 
 ### Documentation
 
diff --git a/UNLICENSE b/UNLICENSE
new file mode 100644
index 0000000..68a49da
--- /dev/null
+++ b/UNLICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>
diff --git a/src/error.rs b/src/error.rs
index 3fb619c..9e25a07 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -98,7 +98,7 @@
     ///
     /// # Example
     ///
-    /// ```rust,no-run
+    /// ```rust,no_run
     /// use std::io;
     /// use std::path::Path;
     ///
diff --git a/src/lib.rs b/src/lib.rs
index 5132dd5..929c565 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -106,7 +106,7 @@
 #![deny(missing_docs)]
 #![allow(unknown_lints)]
 
-#[cfg(test)]
+#[cfg(doctest)]
 doc_comment::doctest!("../README.md");
 
 use std::cmp::{min, Ordering};
@@ -377,13 +377,14 @@
         self
     }
 
-    /// Set a function for sorting directory entries.
+    /// Set a function for sorting directory entries with a comparator
+    /// function.
     ///
     /// If a compare function is set, the resulting iterator will return all
     /// paths in sorted order. The compare function will be called to compare
     /// entries from the same directory.
     ///
-    /// ```rust,no-run
+    /// ```rust,no_run
     /// use std::cmp;
     /// use std::ffi::OsString;
     /// use walkdir::WalkDir;
@@ -398,6 +399,41 @@
         self
     }
 
+    /// Set a function for sorting directory entries with a key extraction
+    /// function.
+    ///
+    /// If a compare function is set, the resulting iterator will return all
+    /// paths in sorted order. The compare function will be called to compare
+    /// entries from the same directory.
+    ///
+    /// ```rust,no_run
+    /// use std::cmp;
+    /// use std::ffi::OsString;
+    /// use walkdir::WalkDir;
+    ///
+    /// WalkDir::new("foo").sort_by_key(|a| a.file_name().to_owned());
+    /// ```
+    pub fn sort_by_key<K, F>(self, mut cmp: F) -> Self
+    where
+        F: FnMut(&DirEntry) -> K + Send + Sync + 'static,
+        K: Ord,
+    {
+        self.sort_by(move |a, b| cmp(a).cmp(&cmp(b)))
+    }
+
+    /// Sort directory entries by file name, to ensure a deterministic order.
+    ///
+    /// This is a convenience function for calling `Self::sort_by()`.
+    ///
+    /// ```rust,no_run
+    /// use walkdir::WalkDir;
+    ///
+    /// WalkDir::new("foo").sort_by_file_name();
+    /// ```
+    pub fn sort_by_file_name(self) -> Self {
+        self.sort_by(|a, b| a.file_name().cmp(b.file_name()))
+    }
+
     /// Yield a directory's contents before the directory itself. By default,
     /// this is disabled.
     ///
diff --git a/src/tests/recursive.rs b/src/tests/recursive.rs
index bbb1ce1..4119f46 100644
--- a/src/tests/recursive.rs
+++ b/src/tests/recursive.rs
@@ -879,7 +879,7 @@
 }
 
 #[test]
-fn sort() {
+fn sort_by() {
     let dir = Dir::tmp();
     dir.mkdirp("foo/bar/baz/abc");
     dir.mkdirp("quux");
@@ -901,6 +901,49 @@
 }
 
 #[test]
+fn sort_by_key() {
+    let dir = Dir::tmp();
+    dir.mkdirp("foo/bar/baz/abc");
+    dir.mkdirp("quux");
+
+    let wd =
+        WalkDir::new(dir.path()).sort_by_key(|a| a.file_name().to_owned());
+    let r = dir.run_recursive(wd);
+    r.assert_no_errors();
+
+    let expected = vec![
+        dir.path().to_path_buf(),
+        dir.join("foo"),
+        dir.join("foo").join("bar"),
+        dir.join("foo").join("bar").join("baz"),
+        dir.join("foo").join("bar").join("baz").join("abc"),
+        dir.join("quux"),
+    ];
+    assert_eq!(expected, r.paths());
+}
+
+#[test]
+fn sort_by_file_name() {
+    let dir = Dir::tmp();
+    dir.mkdirp("foo/bar/baz/abc");
+    dir.mkdirp("quux");
+
+    let wd = WalkDir::new(dir.path()).sort_by_file_name();
+    let r = dir.run_recursive(wd);
+    r.assert_no_errors();
+
+    let expected = vec![
+        dir.path().to_path_buf(),
+        dir.join("foo"),
+        dir.join("foo").join("bar"),
+        dir.join("foo").join("bar").join("baz"),
+        dir.join("foo").join("bar").join("baz").join("abc"),
+        dir.join("quux"),
+    ];
+    assert_eq!(expected, r.paths());
+}
+
+#[test]
 fn sort_max_open() {
     let dir = Dir::tmp();
     dir.mkdirp("foo/bar/baz/abc");