Add helpful details to docstring.
@@ -38,7 +38,9 @@ type DatastoreSegment struct {
ParameterizedQuery string
// QueryParameters may be used to provide query parameters. Care should
// be taken to only provide parameters which are not sensitive.
- // QueryParameters are ignored in high security mode.
+ // QueryParameters are ignored in high security mode. The keys must contain
+ // fewer than than 255 bytes. The values must be numbers, strings, or
+ // booleans.
QueryParameters map[string]interface{}
// Host is the name of the server hosting the datastore.
Host string
