diff --git a/Configuration.md b/Configuration.md
index 6dd4da6..37a1b18 100644
--- a/Configuration.md
+++ b/Configuration.md
@@ -5,7 +5,7 @@ The structure of the file is:
 {
   "randomSeed" : 20,
   "port" : 8888,
-  "captchaExpiryTimeLimit" : 5,
+  "captchaExpiryTimeLimit" : 5,                          // in minutes
   "throttle" : 10,
   "threadDelay" : 2,
   "captchas" : [ {