diff --git a/README.md b/README.md
index d6a4f9a..a38eebc 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,7 @@ true
 | audio/x-wav  | wav       |
 | audio/amr    | amr       |
 | audio/aac    | aac       |
+| audio/aiff   | aiff      |
 
 ### Document
 
diff --git a/lib/matchers.ex b/lib/matchers.ex
index 33d8274..0ca684c 100644
--- a/lib/matchers.ex
+++ b/lib/matchers.ex
@@ -63,6 +63,7 @@ defmodule Infer.Matchers do
       %Infer.Type{matcher_type: :audio, mime_type: "audio/x-wav", extension: "wav", matcher: &Infer.Audio.is_wav/1},
       %Infer.Type{matcher_type: :audio, mime_type: "audio/amr", extension: "amr", matcher: &Infer.Audio.is_amr/1},
       %Infer.Type{matcher_type: :audio, mime_type: "audio/aac", extension: "aac", matcher: &Infer.Audio.is_aac/1},
+      %Infer.Type{matcher_type: :audio, mime_type: "audio/x-aiff", extension: "aiff", matcher: &Infer.Audio.is_aiff/1},
       # Font
       %Infer.Type{matcher_type: :font, mime_type: "application/font-woff", extension: "woff", matcher: &Infer.Font.is_woff/1},
       %Infer.Type{matcher_type: :font, mime_type: "application/font-woff2", extension: "woff2", matcher: &Infer.Font.is_woff2/1},
diff --git a/lib/matchers/audio.ex b/lib/matchers/audio.ex
index 677e848..74c5ac9 100644
--- a/lib/matchers/audio.ex
+++ b/lib/matchers/audio.ex
@@ -67,4 +67,11 @@ defmodule Infer.Audio do
   @spec is_aac(binary()) :: boolean()
   def is_aac(<<0xFF, 0xF1, 0xF9, _rest::binary>>), do: true
   def is_aac(_binary), do: false
+
+  @doc """
+  Takes the binary file contents as arguments. Returns `true` if it's an aiff.
+  """
+  @spec is_aiff(binary()) :: boolean()
+  def is_aiff(<<0x46, 0x4F, 0x52, 0x4D, _data::binary-size(4), 0x41, 0x49, 0x46, 0x46, _rest::binary>>), do: true
+  def is_aiff(_binary), do: false
 end