Discourage making MBEDTLS_PARAM_FAILED() empty.
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 73b5dce..512fb6c 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -292,9 +292,7 @@
* calls that function, but does not provide a default definition for it,
* - or provide a different definition of the macro MBEDTLS_PARAM_FAILED()
* below if the above mechanism is not flexible enough to suit your needs.
- * Note that you may define it to expand to nothing if you're happy to be
- * notified about invalid parameters only in non-void functions, and have
- * void function just silently return early on invalid parameters.
+ * See the documentation of this macro later in this file.
*
* Uncomment to enable validation of application-controlled parameters.
*/
@@ -3062,7 +3060,9 @@
* which case you don't have to worry about declarations or
* definitions. However, you will then be notified about invalid
* parameters only in non-void functions, and void function will
- * just silently return early on invalid parameters.
+ * just silently return early on invalid parameters, which
+ * partially negates the benefits of enabling
+ * #MBEDTLS_CHECK_PARAMS in the first place, so is discouraged.
*
* \param cond The expression that should evaluate to true, but doesn't.
*/