diff --git a/lib/msun/src/s_scalbn.c b/lib/msun/src/s_scalbn.c
index 3de663f8b670..2d4f7a3c6164 100644
--- a/lib/msun/src/s_scalbn.c
+++ b/lib/msun/src/s_scalbn.c
@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2005-2020 Rich Felker, et al.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Please see https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
+ * for all contributors to musl.
+ */
 #include <float.h>
 #include <math.h>
 #include <stdint.h>
diff --git a/lib/msun/src/s_scalbnf.c b/lib/msun/src/s_scalbnf.c
index 3a46470b5661..8cf1e01150da 100644
--- a/lib/msun/src/s_scalbnf.c
+++ b/lib/msun/src/s_scalbnf.c
@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2005-2020 Rich Felker, et al.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Please see https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
+ * for all contributors to musl.
+ */
 #include <math.h>
 #include <stdint.h>
 
diff --git a/lib/msun/src/s_scalbnl.c b/lib/msun/src/s_scalbnl.c
index a79f79b33480..6044c1b1d4f7 100644
--- a/lib/msun/src/s_scalbnl.c
+++ b/lib/msun/src/s_scalbnl.c
@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2005-2020 Rich Felker, et al.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Please see https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
+ * for all contributors to musl.
+ */
 #include <math.h>
 #include <float.h>
 #include "math_private.h"