fix comment
diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index b9d01f3..e1533e8 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -969,7 +969,7 @@
         tree.alloc = 0;
         tree.log = r->connection->log;
 
-        /* todo: 207 */
+        /* TODO: 207 */
 
         if (ngx_walk_tree(&tree, path) != NGX_OK) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;