diff --git a/MACA.md b/MACA.md
index 3c6f4e5..1f64387 100644
--- a/MACA.md
+++ b/MACA.md
@@ -23,6 +23,7 @@
 
    - **2.安装maca_sdk指定版本**
       ```bash
+      yum --showduplicates list |grep maca_sdk
       yum install maca_sdk-<version>-<release>
       ```