diff --git a/src/pages/de/write-smart-contracts/principals.md b/src/pages/de/write-smart-contracts/principals.md
index 7e971203..04dd1626 100644
--- a/src/pages/de/write-smart-contracts/principals.md
+++ b/src/pages/de/write-smart-contracts/principals.md
@@ -147,6 +147,11 @@ The second type of check is more restrictive than the first check, and is helpfu
         (begin (print "Tried to fly without permission!")
                (ok false)))))
 ;;
+;; Authorize a new pilot.
+               (ok true))
+        (begin (print "Tried to fly without permission!")
+               (ok false)))))
+;;
 ;; Authorize a new pilot.
 ;;
 ;;  here we want to ensure that this function