diff --git a/HowtoCeph.md b/HowtoCeph.md
index fc9a866a..61b02617 100644
--- a/HowtoCeph.md
+++ b/HowtoCeph.md
@@ -917,6 +917,7 @@ Aussi, ce _check_, contrairement aux autres, ne permet pas de spécifier le chem
 ### `check_ceph_rgw_api`
 
 ~~~
+# apt install python-awsauth
 # radosgw-admin user create --uid=nagios --display-name='Monitoring user'
 # radosgw-admin caps add --uid=nagios --caps="buckets=read"
 # sudo -u nagios /usr/local/lib/nagios/plugins/check_ceph_rgw_api -H <url> -a <access_key> -s <secret_key>