deploy: 81888ff9f0

api/basic_json/flatten/index.md

@@ -16,7 +16,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
 
 ## Complexity
 
-Linear in the size of the JSON value.
+Linear in the size of the result. Every key repeats the path of its value, so the keys can be larger than the value by a factor of its nesting depth (see [Parsing untrusted input](https://json.nlohmann.me/features/parsing/untrusted_input/#nesting-depth)).
 
 ## Notes