diff --git a/src/c/yammer.c b/src/c/yammer.c
index f7b5de1..6078994 100644
--- a/src/c/yammer.c
+++ b/src/c/yammer.c
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2023  Skylar Widulski
+ * Copyright (C) 2024  Skylar Widulski
  *
  * This file is part of Yammer.
  *
diff --git a/src/c/yammer.h b/src/c/yammer.h
index 1a77c9d..b66c835 100644
--- a/src/c/yammer.h
+++ b/src/c/yammer.h
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2023  Skylar Widulski
+ * Copyright (C) 2024  Skylar Widulski
  *
  * This file is part of Yammer.
  *
diff --git a/src/guile/yammer.scm b/src/guile/yammer.scm
index 4e58c59..998b237 100644
--- a/src/guile/yammer.scm
+++ b/src/guile/yammer.scm
@@ -1,5 +1,5 @@
 ;;;
-;;; Copyright (C) 2023  Skylar Widulski
+;;; Copyright (C) 2024  Skylar Widulski
 ;;;
 ;;; This file is part of Yammer.
 ;;;
diff --git a/src/guile/yammer/ffi.scm b/src/guile/yammer/ffi.scm
index be5687e..ea03fdf 100644
--- a/src/guile/yammer/ffi.scm
+++ b/src/guile/yammer/ffi.scm
@@ -1,3 +1,22 @@
+;;;
+;;; Copyright (C) 2024  Skylar Widulski
+;;;
+;;; This file is part of Yammer.
+;;;
+;;; Yammer is free software: you can redistribute it and/or modify it under the
+;;; terms of the GNU General Public License as published by the Free Software
+;;; Foundation, either version 3 of the License, or (at your option) any later
+;;; version.
+;;;
+;;; Yammer is distributed in the hope that it will be useful, but WITHOUT ANY
+;;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+;;; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+;;; details.
+;;;
+;;; You should have received a copy of the GNU General Public License along with
+;;; Yammer. If not, see <https://www.gnu.org/licenses/>.
+;;;
+
 (define-module (yammer ffi)
   #:use-module (system foreign)
   #:export (FFTW_ESTIMATE