message: Grammatical Error
diff: @@ -33,7 +33,7 @@ Post-Aggregations
  -----------------
  Druid supports post aggregation and this works in Superset. All you have to
  -do is creating a metric, much like you would create an aggregation manually,
  +do is create a metric, much like you would create an aggregation manually,
  but specify ``postagg`` as a ``Metric Type``. You then have to provide a valid
  json post-aggregation definition (as specified in the Druid docs) in the
  Json field.
  