diff --git a/sparql/cell_by_location.rq b/sparql/cell_by_location.rq
index 89081f4..04bf34f 100644
--- a/sparql/cell_by_location.rq
+++ b/sparql/cell_by_location.rq
@@ -1,19 +1,18 @@
-#+ summary: Find cells by location
-#+ description: Enter an anatomical location, get back a list of cell type IRIs and labels
+#+ summary: Find cells by type and location
+#+ description: Input: anatomical location IRI (default added as example); optionally specify a cell type IRI. Returns a list of cell type IRIs and labels. 
 
 #+ defaults:
 #+   - location: http://purl.obolibrary.org/obo/UBERON_0002113
+#+   - cell: http://purl.obolibrary.org/obo/CL_0000000
+
 
 PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
 PREFIX owl: <http://www.w3.org/2002/07/owl#>
 PREFIX overlaps: <http://purl.obolibrary.org/obo/RO_0002131>
-PREFIX cell: <http://purl.obolibrary.org/obo/CL_0000000>
 
 SELECT DISTINCT ?cell_iri (STR(?qlabel) as ?cell_label)
 WHERE {
-   ?cell_iri overlaps: ?_location_iri .
-   ?cell_iri rdfs:subClassOf cell: .
+   ?_cell_iri overlaps: ?_location_iri .
+   ?cell_iri rdfs:subClassOf ?_cell_iri: .
    ?cell_iri rdfs:label ?qlabel .
   }
-
-