diff --git a/R/readNWISunit.r b/R/readNWISunit.r
index 5f221c2a8d6b72b4bee31dba18272e6552dd6e0c..35fb12549aa9d3877ab7f53c6a5b4728899fb226 100644
--- a/R/readNWISunit.r
+++ b/R/readNWISunit.r
@@ -287,6 +287,7 @@ readNWISmeas <- function (siteNumbers,startDate="",endDate="", tz=""){
 #' data <- readNWISgwl(siteNumber, '','')
 #' sites <- c("434400121275801", "375907091432201")
 #' data2 <- readNWISgwl(sites, '','')
+#' data3 <- readNWISgwl("420125073193001", '','')
 readNWISgwl <- function (siteNumbers,startDate="",endDate=""){  
   
   url <- constructNWISURL(siteNumbers,NA,startDate,endDate,"gwlevels",format="wml1")
diff --git a/man/readNWISgwl.Rd b/man/readNWISgwl.Rd
index b44e9e1be4a7e02dc271649814fefc2b661a81f0..d2520bc7a4dde7f28af54f4545dcff2e1707fd10 100644
--- a/man/readNWISgwl.Rd
+++ b/man/readNWISgwl.Rd
@@ -55,6 +55,7 @@ siteNumber <- "434400121275801"
 data <- readNWISgwl(siteNumber, '','')
 sites <- c("434400121275801", "375907091432201")
 data2 <- readNWISgwl(sites, '','')
+data3 <- readNWISgwl("420125073193001", '','')
 }
 \seealso{
 \code{\link{renameNWISColumns}}, \code{\link{importWaterML1}}