diff --git a/library/x509_crt.c b/library/x509_crt.c
index fcc9579..18bc87c 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -1614,7 +1614,8 @@
 }
 
 /*
- * Check that the given certificate is valid according to the CRL.
+ * Check that the given certificate is not revoked according to the CRL.
+ * Skip validation if no CRL for the given CA is present.
  */
 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
                                mbedtls_x509_crl *crl_list,