diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1f91bb5..54d679a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 * Remove `prelude-fullscreen`, as these days people can use `toggle-frame-fullscreen` instead. (it was introduced in Emacs 24.4)
 * Removed `beacon-mode`.
 * Add the `ag` package. It provides a nice alternative to `grep` and has nice Projectile integration.
+* Auto-install `adoc-mode` for AsciiDoc files.
 
 ### Bugs fixed
 
diff --git a/core/prelude-packages.el b/core/prelude-packages.el
index efa1731..7b839e6 100644
--- a/core/prelude-packages.el
+++ b/core/prelude-packages.el
@@ -141,7 +141,8 @@ PACKAGE is installed only if not already present.  The file is opened in MODE."
                                  (,mode)))))
 
 (defvar prelude-auto-install-alist
-  '(("\\.clj\\'" clojure-mode clojure-mode)
+  '(("\\.adoc\\'" adoc-mode adoc-mode)
+    ("\\.clj\\'" clojure-mode clojure-mode)
     ("\\.cmake\\'" cmake-mode cmake-mode)
     ("CMakeLists\\.txt\\'" cmake-mode cmake-mode)
     ("\\.coffee\\'" coffee-mode coffee-mode)