diff --git a/README.md b/README.md
index 0f44860..42a014b 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@
 
 It is meant to be run daily by cron on servers on at boot time for workstations (you can obviously configure it how you prefer).
 
+# Usage
+
+**pkgupdate** has only one flag `-q` to hide successful messages, preventing to send an email from cron scripts if it worked.
+
 # How?
 
 **pkgupdate** uses 3 tricks to speed up the process, this is particularily important for workstations updating during the boot process: