addCommentTag mutation works

graph/typeDefs.graphql

@@ -631,6 +631,13 @@ type SetCommentStatusResponse implements Response {
   errors: [UserError]
 }
 
+# Response to addCommentTag mutation
+type AddCommentTagResponse implements Response {
+  # An array of errors relating to the mutation that occured.
+  comment: Comment
+  errors: [UserError]  
+}
+
 # All mutations for the application are defined on this object.
 type RootMutation {
 
@@ -654,6 +661,9 @@ type RootMutation {
 
   # Sets Comment status. Requires the `ADMIN` role.
   setCommentStatus(id: ID!, status: COMMENT_STATUS!): SetCommentStatusResponse
+
+  # Add tag to comment.
+  addCommentTag(id: ID!, tag: String!): AddCommentTagResponse
 }
 
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