diff --git a/docs/user/quickstart.rst b/docs/user/quickstart.rst
index 3755d26239..d0f920253e 100644
--- a/docs/user/quickstart.rst
+++ b/docs/user/quickstart.rst
@@ -271,7 +271,13 @@ use the same key::
       },
       ...
     }
+
+    # Note: httpbin.org adds a changing header ("X-Amzn-Trace-Id") to each response,
+    # so r1.text == r2.text may be False even if the form data matches.
+    # Instead, compare the form data in the JSON response:
     >>> r1.text == r2.text
+    False
+    >>> r1.json()['form'] == r2.json()['form']
     True
 
 There are times that you may want to send data that is not form-encoded. If