diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..ded968c
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,15 @@
+# Changelog
+
+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).
+
+## 0.1.1 (2022-01-09)
+
+* Enhancements
+  * Add AIFF audio file support
+
+## 0.1.0 (2021-12-26)
+
+Initial release
diff --git a/README.md b/README.md
index a38eebc..43a5223 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ by adding `infer` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:infer, "~> 0.1.0"}
+    {:infer, "~> 0.1.1"}
   ]
 end
 ```
diff --git a/lib/matchers/doc.ex b/lib/matchers/doc.ex
index 3a451a0..6aab34a 100644
--- a/lib/matchers/doc.ex
+++ b/lib/matchers/doc.ex
@@ -208,13 +208,11 @@ defmodule Infer.Doc do
     root_directory_address = sector_size + root_directory_index * sector_size
     position = root_directory_address + 80
 
-    <<_offset::binary-size(position), guid::binary-size(16), _rest::binary>> = doc
-
-    case guid do
-      <<16, 141, 129, 100, 155, 79, 207, 17, 134, 234, 0, 170, 0, 185, 41, 232>> -> :ppt
-      <<6, 9, 2, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 70>> -> :doc
-      <<32, 8, 2, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 70>> -> :xls
-      <<32, 8, 1, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 70>> -> :xls
+    case doc do
+      <<_offset::binary-size(position), 16, 141, 129, 100, 155, 79, 207, 17, 134, 234, 0, 170, 0, 185, 41, 232, _rest::binary>> -> :ppt
+      <<_offset::binary-size(position), 6, 9, 2, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 70, _rest::binary>> -> :doc
+      <<_offset::binary-size(position), 32, 8, 2, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 70, _rest::binary>> -> :xls
+      <<_offset::binary-size(position), 32, 8, 1, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 70, _rest::binary>> -> :xls
       _ -> nil
     end
   end
diff --git a/mix.exs b/mix.exs
index e6c96eb..f7a840d 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule Infer.MixProject do
   def project do
     [
       app: :infer,
-      version: "0.1.0",
+      version: "0.1.1",
       elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps(),