Fixing issue 691

Author: kramanse

docs/filter-sort.md

@@ -35,6 +35,8 @@ API help](https://help.tableau.com/current/api/rest_api/en-us/REST/rest_api_conc
 
 To filter on a field, you need to specify the field name, an operator criteria and a value criteria.
 
+**Note**: Ampersands and commas in filters are not supported by the rest api as they are used as delimiters.
+
 ### Operator criteria
 
 The operator that you want to use for that field. For example, you can use the Equals operator to get everything from the endpoint that matches exactly.