diff --git a/lib/Graphics/Fountainhead/Compression.hs b/lib/Graphics/Fountainhead/Compression.hs
index c1a05fc..40aed97 100644
--- a/lib/Graphics/Fountainhead/Compression.hs
+++ b/lib/Graphics/Fountainhead/Compression.hs
@@ -1,3 +1,7 @@
+{- This Source Code Form is subject to the terms of the Mozilla Public License,
+   v. 2.0. If a copy of the MPL was not distributed with this file, You can
+   obtain one at https://mozilla.org/MPL/2.0/. -}
+
 -- | Font compression and decompression.
 module Graphics.Fountainhead.Compression
     ( compress
diff --git a/src/Main.hs b/src/Main.hs
index 984f2d7..5e43722 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,3 +1,7 @@
+{- This Source Code Form is subject to the terms of the Mozilla Public License,
+   v. 2.0. If a copy of the MPL was not distributed with this file, You can
+   obtain one at https://mozilla.org/MPL/2.0/. -}
+
 {-# LANGUAGE RecordWildCards #-}
 module Main
     ( main