@@ -402,3 +402,17 @@ produces: [%who '~zod' %where /ford/pages/web %case 60]
402402
403403Wide-form `/$` takes its arguments inside brackets, like `/~`:
404404`/=gas=/$[fuel]`
405+
406+### `/%` propagate extra arguments into renderers
407+
408+`/%` will forward extra arguments (usually from `%eyre`) on to any enclosed `/renderer/`'s. Without this,
409+renderers that use `/$` to read the extra arguments will crash.
410+
411+Example:
412+```
413+/= dat /% /tree-json/
414+::
415+dat
416+```
417+produces the results of running `ren/tree-json` on the current path. This renderer needs the query string,
418+which is one of the extra arguments passed in from `%eyre`.