diff --git a/CHANGELOG.md b/CHANGELOG.md
index 417cb4e..24f53ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [0.16.1] - 2 January 2019
+
+### Change
+
+- [`head`](src/head/head.js) returns `undefined` if source is empty or not array
+
 ## [0.16.0] - 1 January 2019
 
 ### Change
@@ -153,8 +159,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Removed `flow` support
 
-[Unreleased]: https://github.com/asd14/m/compare/v0.16.0...HEAD
+[Unreleased]: https://github.com/asd14/m/compare/v0.16.1...HEAD
 
+[0.16.1]: https://github.com/asd14/m/compare/v0.16.0...v0.16.1
 [0.16.0]: https://github.com/asd14/m/compare/v0.15.3...v0.16.0
 [0.15.3]: https://github.com/asd14/m/compare/v0.15.2...v0.15.3
 [0.15.2]: https://github.com/asd14/m/compare/v0.15.1...v0.15.2
diff --git a/README.md b/README.md
index 4bd0573..ed2f69b 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Changes a lot and not yet complete. Use [Ramda](https://github.com/ramda/ramda)
 - [Develop](#develop)
 - [Use](#use)
 - [Changelog](#changelog)
-    - [0.16.0 - 1 January 2019](#0160---1-january-2019)
+    - [0.16.1 - 2 January 2019](#0161---2-january-2019)
 
 <!-- /MarkdownTOC -->
 
@@ -40,21 +40,18 @@ const { sep } = require("path")
 const { pipe, compose, join, push, dropLast, split } = require("@asd14/m")
 
 // Compose - g(f(x))
-//
 const renameFile = newName => filePath =>
   compose(
     join(sep), push(newName), dropLast, split(sep)
   )(filePath)
 
 // Pipe - x -> f -> g
-//
 const renameFile = newName => filePath =>
   pipe(
     split(sep), dropLast, push(newName), join(sep) 
   )(filePath)
 
-// When using the new pipeline operator, things are even more expressive
-//
+// Using the pipeline operator, things are more expressive
 const renameFile = newName => filePath =>
   filePath |> split(sep) |> dropLast |> push(newName) |> join(sep)
 ```
@@ -100,8 +97,8 @@ const renameFile = newName => pipe(
 
 History of all changes in [CHANGELOG.md](CHANGELOG.md)
 
-### 0.16.0 - 1 January 2019
+### 0.16.1 - 2 January 2019
 
 #### Change
 
-- Allow [`replaceBy`](src/replace-by/replace-by.js#L45) to accept an update function
+- [`head`](src/head/head.js) returns `undefined` if source is empty or not array