diff --git a/docs/1.detailed_config.md b/docs/1.detailed_config.md
index 21fc9b7..fb6232c 100644
--- a/docs/1.detailed_config.md
+++ b/docs/1.detailed_config.md
@@ -59,6 +59,7 @@
 ### trainer_cfg
 * Trainer configuration
 >  * Args
+>     * restore_hint: `int` value indicates the iteration number of restored checkpoint; `str` value indicates the path to restored checkpoint. The option is often used to finetune on new dataset or restore the interrupted training process.
 >     * fix_BN: If `True`, we fix the weight of all `BatchNorm` layers.
 >     * log_iter: Log the information per `log_iter` iterations.
 >     * save_iter: Save the checkpoint per `save_iter` iterations.