diff --git a/R/whatNWISsites.R b/R/whatNWISsites.R
index fbc26a325c5f8555dbfbfed0a1f8e990d0803f33..eea94eda34162c8ae4b4aba13d836dd5425d7f9d 100644
--- a/R/whatNWISsites.R
+++ b/R/whatNWISsites.R
@@ -69,6 +69,7 @@ whatNWISsites <- function(...){
     retval <- retval[!duplicated(retval),]
     
     retval$queryTime <- Sys.time()
+    attr(retVal, "url") <- urlCall
     
     return(retval)
   } else {