diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index cf0270a9c1..11729e8c85 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1,3 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * This code is based on a version (aka dlmalloc) of malloc/free/realloc written
+ * by Doug Lea and released to the public domain, as explained at
+ * http://creativecommons.org/publicdomain/zero/1.0/-
+ *
+ * The original code is available at http://gee.cs.oswego.edu/pub/misc/
+ * as file malloc-2.6.6.c.
+ */
+
 #include <common.h>
 #include <log.h>
 #include <asm/global_data.h>
diff --git a/include/malloc.h b/include/malloc.h
index 024b18be00..1fbaf3755c 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -1,12 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
-  A version of malloc/free/realloc written by Doug Lea and released to the
-  public domain.  Send questions/comments/complaints/performance data
-  to dl@cs.oswego.edu
+  This code is based on a version of malloc/free/realloc written by Doug Lea and
+  released to the public domain. Send questions/comments/complaints/performance
+  data to dl@cs.oswego.edu
 
 * VERSION 2.6.6  Sun Mar  5 19:10:03 2000  Doug Lea  (dl at gee)
 
    Note: There may be an updated version of this malloc obtainable at
-	   ftp://g.oswego.edu/pub/misc/malloc.c
+	   http://g.oswego.edu/pub/misc/malloc.c
 	 Check before installing!
 
 * Why use this malloc?