diff --git a/README.md b/README.md
index 7ea2387..c0987a4 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ check_expire follows the usual Nagios rules. The options are:
 * -w: warning threshold in days
 * -v: verbose details in output
 * -u: unixtime output
+* -t: timeout for RDAP requetss (in seconds)
 
 ## Installation
 
@@ -30,6 +31,7 @@ object CheckCommand "expiration" {
       "-H" = "$address$",
       "-c" = "$expiration_critical$",
       "-w" = "$expiration_warning$",
+      "-t" = "$expiration_timeout$",
       "-v" = { set_if = "$expiration_verbose$" }
   }