diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index d7662ef..3fec100 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -3119,7 +3119,10 @@
  *          library/x509_csr.c
  *
  * Requires: MBEDTLS_ASN1_PARSE_C, MBEDTLS_BIGNUM_C, MBEDTLS_OID_C,
- *           MBEDTLS_PK_PARSE_C
+ *           (MBEDTLS_MD_C or MBEDTLS_USE_PSA_CRYPTO)
+ *
+ * \warning If building without MBEDTLS_MD_C, you must call psa_crypto_init()
+ * before doing any PKCS#1 v2.1 operation.
  *
  * This module is required for the X.509 parsing modules.
  */
@@ -3176,7 +3179,11 @@
  *
  * Module:  library/x509_create.c
  *
- * Requires: MBEDTLS_BIGNUM_C, MBEDTLS_OID_C, MBEDTLS_PK_WRITE_C
+ * Requires: MBEDTLS_BIGNUM_C, MBEDTLS_OID_C,
+ *           (MBEDTLS_MD_C or MBEDTLS_USE_PSA_CRYPTO)
+ *
+ * \warning If building without MBEDTLS_MD_C, you must call psa_crypto_init()
+ * before doing any PKCS#1 v2.1 operation.
  *
  * This module is the basis for creating X.509 certificates and CSRs.
  */