diff --git a/doc/doc_ch/detection.md b/doc/doc_ch/detection.md
index 08b309cbc0def059df1f12a180be39d94511a78c..ae16ec991c30bbb9faee7d91020b3e450978a518 100644
--- a/doc/doc_ch/detection.md
+++ b/doc/doc_ch/detection.md
@@ -18,7 +18,7 @@ PaddleOCR 也提供了数据格式转换脚本，可以将官网 label 转换支
 
 ```
 # 将官网下载的标签文件转换为 train_icdar2015_label.txt
-python gen_label.py --mode="det" --root_path="icdar_c4_train_imgs/"  \
+python gen_label.py --mode="det" --root_path="/path/to/icdar_c4_train_imgs/"  \
                     --input_path="ch4_training_localization_transcription_gt" \
                     --output_label="train_icdar2015_label.txt"
 ```