diff --git a/README.md b/README.md
index 8bcb840..fe0e821 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ ca:
     ext_key_usage: 
         - 1
         - 2
-        duration: 518400 #1 year
+        duration: "8760h0m0s" #1 year
 client:
     serial_number: 12151232 # serial number
     subject:
@@ -51,7 +51,7 @@ client:
     ext_key_usage: 
         - 1
         - 2
-    duration: 518400
+    duration: "8760h0m0s"
 ```
 ## Execution
 Then you can just run