diff --git a/README.md b/README.md
index 53ef8805181465186ee45f15fbb90893b98e52cc..d46f9984727f67df68f064f9745d48ab94802dc6 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,8 @@ sudo apt install tango-starter tango-test liblog4j1.2-java
 > sudo apt install --assume-yes wget\
    wget -c https://people.debian.org/~picca/libtango-java_XX_version.deb\
    sudo dpkg -i ./libtango-java_XX_version.deb
-sudo apt install python3-tango   
+sudo apt install python3-tango  
+sudo apt-install python3-h5py 
 ```
 
 you have to declare device in your tango environnement