diff --git a/include/mbedtls/build_info.h b/include/mbedtls/build_info.h
index 510e1a5..872e841 100644
--- a/include/mbedtls/build_info.h
+++ b/include/mbedtls/build_info.h
@@ -122,6 +122,8 @@
 
 #include "mbedtls/config_adjust_legacy_crypto.h"
 
+#include "mbedtls/config_adjust_x509.h"
+
 /* The following blocks make it easier to disable all of TLS,
  * or of TLS 1.2 or 1.3 or DTLS, without having to manually disable all
  * key exchanges, options and extensions related to them. */
diff --git a/include/mbedtls/config_adjust_x509.h b/include/mbedtls/config_adjust_x509.h
new file mode 100644
index 0000000..99a0ace
--- /dev/null
+++ b/include/mbedtls/config_adjust_x509.h
@@ -0,0 +1,37 @@
+/**
+ * \file mbedtls/config_adjust_x509.h
+ * \brief Adjust X.509 configuration
+ *
+ * Automatically enable certain dependencies. Generally, MBEDLTS_xxx
+ * configurations need to be explicitly enabled by the user: enabling
+ * MBEDTLS_xxx_A but not MBEDTLS_xxx_B when A requires B results in a
+ * compilation error. However, we do automatically enable certain options
+ * in some circumstances. One case is if MBEDTLS_xxx_B is an internal option
+ * used to identify parts of a module that are used by other module, and we
+ * don't want to make the symbol MBEDTLS_xxx_B part of the public API.
+ * Another case is if A didn't depend on B in earlier versions, and we
+ * want to use B in A but we need to preserve backward compatibility with
+ * configurations that explicitly activate MBEDTLS_xxx_A but not
+ * MBEDTLS_xxx_B.
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef MBEDTLS_CONFIG_ADJUST_X509_H
+#define MBEDTLS_CONFIG_ADJUST_X509_H
+
+#endif /* MBEDTLS_CONFIG_ADJUST_X509_H */