diff --git a/readme.md b/readme.md
index c38b182..7a37d2c 100644
--- a/readme.md
+++ b/readme.md
@@ -108,6 +108,7 @@ PJ_NGW_S2_090_T80_001/
 | gear_housing | 减速器壳体 | |
 | mid_housing | 级间壳/隔套 | 两级以上常见 |
 | bearing_seat | 轴承座 | |
+| bearing | 轴承 | |
 | encoder_cover | 编码器盖 | |
 | brake_disk_seat | 抱闸座 | 可选 |
 | seal_cover | 密封盖 | |