diff --git a/testsuite/md2-test.c b/testsuite/md2-test.c
index 087f47105d3359a96813d885bb6e4b88db17a693..8ab45c170e1e0bdda400c7b99441462be734551b 100644
--- a/testsuite/md2-test.c
+++ b/testsuite/md2-test.c
@@ -4,6 +4,7 @@
 int
 test_main(void)
 {
+  /* Testcases from RFC 1319 */
   test_hash(&nettle_md2, 0, "",
 	    H("8350e5a3e24c153df2275c9f80692773"));
   test_hash(&nettle_md2, LDATA("a"),
diff --git a/testsuite/md4-test.c b/testsuite/md4-test.c
index 522934642176c191eae723d7edce8e0b9c797121..efc3b5f07cb223d9b85e1a9d5d76d4aafa1305f5 100644
--- a/testsuite/md4-test.c
+++ b/testsuite/md4-test.c
@@ -4,6 +4,7 @@
 int
 test_main(void)
 {
+  /* Testcases from RFC 1320 */
   test_hash(&nettle_md4, LDATA(""),
 	    H("31d6cfe0d16ae931b73c59d7e0c089c0"));
   test_hash(&nettle_md4, LDATA("a"),