diff --git a/docs/proposed/grid-manager/managed-grid.rst b/docs/proposed/grid-manager/managed-grid.rst
index 9f392f292..602d93611 100644
--- a/docs/proposed/grid-manager/managed-grid.rst
+++ b/docs/proposed/grid-manager/managed-grid.rst
@@ -60,16 +60,12 @@ at which time you may be able to pass a directory-capability to this
 option).
 
 If you don't want to store the configuration on disk at all, you may
-use ``--config -`` (that's a dash) and write a valid JSON (YAML? I'm
-guessing JSON is easier to deal with here, more-interoperable?)
+use ``--config -`` (that's a dash) and write a valid JSON
 configuration to stdin.
 
 All commands take the ``--config`` option, and they all behave
 similarly for "data from stdin" versus "data from disk".
 
-DECIDE:
- - config is YAML or JSON?
-
 
 tahoe grid-manager create
 `````````````````````````