diff --git a/s48/srfi-10/test/math.scm b/s48/srfi-10/test/math.scm
index 4ef9b81..df5b7c9 100644
--- a/s48/srfi-10/test/math.scm
+++ b/s48/srfi-10/test/math.scm
@@ -1,3 +1,5 @@
+;;; This file is part of the Scheme Untergrund Library.
+
 ;; This code, written by Taylor Campbell, is in the public domain.
 
 (define (circumference r) (* '#,(pi) 2 r))
diff --git a/s48/srfi-10/test/pi.scm b/s48/srfi-10/test/pi.scm
index 4404460..4e4753c 100644
--- a/s48/srfi-10/test/pi.scm
+++ b/s48/srfi-10/test/pi.scm
@@ -1,3 +1,5 @@
+;;; This file is part of the Scheme Untergrund Library.
+
 ;; This code, written by Taylor Campbell, is in the public domain.
 
 ;; If the #, is uncommented, the ' should be commented; and vice versa.