diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index be7da28..63db5ee 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -179,6 +179,34 @@
 //#define POLARSSL_PLATFORM_FPRINTF_ALT
 //#define POLARSSL_PLATFORM_PRINTF_ALT
 //#define POLARSSL_PLATFORM_SNPRINTF_ALT
+
+/**
+ * \def POLARSSL_DEPRECATED_WARNING
+ *
+ * Mark deprecated functions so that they generate a warning if used.
+ * Functions deprecated in one version will usually be removed in the next
+ * version. You can enable this to help you prepare the transition to a new
+ * major version by making sure your code is not using these functions.
+ *
+ * This only works with GCC and Clang. With other compilers, you may want to
+ * use POLARSSL_DEPRECATED_REMOVED
+ *
+ * Uncomment to get warnings on using deprecated functions.
+ */
+//#define POLARSSL_DEPRECATED_WARNING
+
+/**
+ * \def POLARSSL_DEPRECATED_REMOVED
+ *
+ * Remove deprecated functions so that they generate an error if used.
+ * Functions deprecated in one version will usually be removed in the next
+ * version. You can enable this to help you prepare the transition to a new
+ * major version by making sure your code is not using these functions.
+ *
+ * Uncomment to get errors on using deprecated functions.
+ */
+//#define POLARSSL_DEPRECATED_REMOVED
+
 /* \} name SECTION: System support */
 
 /**