diff --git a/testsuite/cbc-test.m4 b/testsuite/cbc-test.m4
index 6dba1e626a7c4fb3ab89a32a972228de6459b6d7..8173e457cb2e65ba835b0197dda6ea241f78d6a1 100644
--- a/testsuite/cbc-test.m4
+++ b/testsuite/cbc-test.m4
@@ -10,6 +10,16 @@ uint8_t cipher[2 * AES_BLOCK_SIZE];
 uint8_t clear[2 * AES_BLOCK_SIZE];
 uint8_t iv[AES_BLOCK_SIZE];
 
+/* Intermediate values:
+ *   iv XOR first message block:
+ *       "a5 ce 55 d4 21 15 a1 c6 4a a4 0c b2 ca a6 d1 37"
+ *   First ciphertext block, c1:
+ *       "1f 94 fc 85 f2 36 21 06 4a ea e3 c9 cc 38 01 0e"
+ *   c1 XOR second message block:
+ *       "3f e0 94 ec 81 16 4e 68 26 93 c3 a6 a2 5b 64 2f"
+ *   Second ciphertext block, c1:
+ *       "7b f6 5f c5 02 59 2e 71 af bf 34 87 c0 36 2a 16"
+ */
 H(iv, "e9 a7 26 a0 44 7b 8d e6  03 83 60 de ea d5 b0 4e");
 aes_set_key(&ctx.ctx, 32, H("8d ae 93 ff fc 78 c9 44"
 			    "2a bd 0c 1e 68 bc a6 c7"
diff --git a/testsuite/des3-test.m4 b/testsuite/des3-test.m4
index 7baa2cfa299fba7167733868e5f7862661765521..86056f68dfe638992ed5dfd134e1218ac3a54375 100644
--- a/testsuite/des3-test.m4
+++ b/testsuite/des3-test.m4
@@ -8,8 +8,9 @@ uint8_t msg[DES3_BLOCK_SIZE] = "Now is t";
 uint8_t cipher[DES3_BLOCK_SIZE];
 uint8_t clear[DES3_BLOCK_SIZE];
 
-/* Intermediate values: "cd ea 2a 20 c2 e0 9e 48"
- *                      "69 52 6e 95 8b ea 49 bd"
+/* Intermediate values:
+ *   After first DES encryption:  "cd ea 2a 20 c2 e0 9e 48"
+ *   After second DES decryption: "69 52 6e 95 8b ea 49 bd"
  */
 if (!des3_set_key(&ctx, H("3e 0b 10 b0 5d 49 c2 54"
 			  "6b 46 e0 75 8a 91 61 85"