diff --git a/Installations_guide_centos.md b/Installations_guide_centos.md
index 0f85a2f..4f3c7c6 100644
--- a/Installations_guide_centos.md
+++ b/Installations_guide_centos.md
@@ -63,7 +63,7 @@
    
  ## Installation of Docker in centos
  
-- yum update -y 
+- sudo yum update -y 
 - sudo yum remove docker \
                   docker-client \
                   docker-client-latest \