Fix a syntax error in documentation

diff --git a/docs/transfers.rst b/docs/transfers.rst
index d39a0c4363234f6f4662dd7d25b36b8d4e89754b..d2d990df720edfe961275e407b905c7cb9a86be7 100644 (file)
--- a/docs/transfers.rst
+++ b/docs/transfers.rst
@@ -52,7 +52,7 @@ Example
     if isinstance(res, NeedTANResponse):
         print(res.challenge)
 
-        if getattr(res, challenge_hhduc, None):
+        if getattr(res, 'challenge_hhduc', None):
             try:
                 terminal_flicker_unix(res.challenge_hhduc)
             except KeyboardInterrupt: