diff --git a/library/x509_crt.c b/library/x509_crt.c
index 5969247..abd70e1 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -99,13 +99,15 @@
  * concerns. */
 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
 {
-    /* Hashes from SHA-256 and above */
+    /* Hashes from SHA-256 and above. Note that this selection
+     * should be aligned with ssl_preset_default_hashes in ssl_tls.c. */
     MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
     MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
     MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
     0xFFFFFFF, /* Any PK alg    */
 #if defined(MBEDTLS_ECP_C)
-    /* Curves at or above 128-bit security level */
+    /* Curves at or above 128-bit security level. Note that this selection
+     * should be aligned with ssl_preset_default_curves in ssl_tls.c. */
     MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
     MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
     MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |