diff --git a/src/feature/dirauth/authmode.h b/src/feature/dirauth/authmode.h
index bfd5f4dc04..11bc40d8d1 100644
--- a/src/feature/dirauth/authmode.h
+++ b/src/feature/dirauth/authmode.h
@@ -27,6 +27,7 @@ authdir_mode_v3(const or_options_t *options)
   return authdir_mode(options) && options->V3AuthoritativeDir != 0;
 }
 
+/* Is the dirauth module enabled? */
 #define have_module_dirauth() (1)
 
 #else /* !defined(HAVE_MODULE_DIRAUTH) */