diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
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--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,21 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+The format is based on [Keep a Changelog].
+
+## 1.0 (released 2019-09-20)
+### Added
+* Package `apheleia`
+* Command `apheleia-format-buffer`
+* User options:
+  * `apheleia-formatters`, with supported formatters:
+    * `black`
+    * `prettier`
+    * `gofmt`
+    * `terraform`
+  * `apheleia-mode-alist`
+  * `apheleia-post-format-hook`
+* Variable `apheleia-formatter`
+* Minor mode `apheleia-mode` (and `apheleia-global-mode`)
+
+[keep a changelog]: https://keepachangelog.com/en/1.0.0/
diff --git a/apheleia.el b/apheleia.el
index bfb382e7..7fd985d3 100644
--- a/apheleia.el
+++ b/apheleia.el
@@ -7,7 +7,7 @@
 ;; Homepage: https://github.com/raxod502/apheleia
 ;; Keywords: tools
 ;; Package-Requires: ((emacs "25.2"))
-;; Version: 0
+;; Version: 1.0
 
 ;;; Commentary: