diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
index b5cc9a7f1c9..b561e9d6bee 100644
--- a/src/openvpn/ssl_openssl.c
+++ b/src/openvpn/ssl_openssl.c
@@ -2249,8 +2249,10 @@ show_available_tls_ciphers_list(const char *cipher_list,
 void
 show_available_curves(void)
 {
-    printf("Consider using openssl 'ecparam -list_curves' as\n"
-           "alternative to running this command.\n");
+    printf("Consider using 'openssl ecparam -list_curves' as alternative to running\n"
+           "this command.\n"
+           "Note this output does only list curves/groups that OpenSSL considers as\n"
+           "builtin EC curves. It does not list additional curves nor X448 or X25519\n");
 #ifndef OPENSSL_NO_EC
     EC_builtin_curve *curves = NULL;
     size_t crv_len = 0;