Update supportedformats.rst

mappingengine/featureslist/supportedformats.rst

@@ -56,14 +56,14 @@ All other column identifiers are exposed as child elements of the .record Backbo
   
 2. CSV file contains no header metadata:
 
-Regardless if the CSV file contains a header, all elements are accessible for the mapping to FHIR. For files not containing a metadata row, element names for the mapping source are generated dynamically as ``field#``: :: 
+Regardless if the CSV file contains a header, all elements are accessible for the mapping to FHIR. For files not containing a metadata row, element names for the mapping source are generated dynamically as ``field#`` (starting with field0): :: 
 
   src.record as record then 
   {
-    record.field1 as id -> tgt.identifier = id('<system>', id);
-    record.field2 as given -> tgt.name as name, name.given = given;
-    record.field3 as family -> tgt.name as name collate, name.family = family;
-    record.field4 as gender -> tgt.gender = translate('<ConceptMap>', gender, 'code');
+    record.field0 as id -> tgt.identifier = id('<system>', id);
+    record.field1 as given -> tgt.name as name, name.given = given;
+    record.field2 as family -> tgt.name as name collate, name.family = family;
+    record.field3 as gender -> tgt.gender = translate('<ConceptMap>', gender, 'code');
   };
 
 (C)-CDA