diff --git a/R/api.R b/R/api.R
index 6f112ff..89c3bcb 100644
--- a/R/api.R
+++ b/R/api.R
@@ -15,7 +15,7 @@ get_boxes_ = function (..., endpoint) {
   response = osem_request_(endpoint, path = c('boxes'), ...)
 
   if (length(response) == 0) {
-    warning('no boxes found for this query')
+    warning('no senseBoxes found for this query')
     return(osem_as_sensebox(as.data.frame(response)))
   }
 
diff --git a/R/box.R b/R/box.R
index 3854459..49356d8 100644
--- a/R/box.R
+++ b/R/box.R
@@ -19,7 +19,7 @@
 #' @param phenomenon Only return boxes that measured the given phenomenon in the
 #'   time interval as specified through \code{date} or \code{from / to}
 #' @param endpoint The URL of the openSenseMap API instance
-#' @param progress Whether to print download progress information
+#' @param progress Whether to print download progress information defaults to \code{TRUE}
 #' @return A \code{sensebox data.frame} containing a box in each row
 #'
 #' @seealso \href{https://docs.opensensemap.org/#api-Measurements-findAllBoxes}{openSenseMap API documentation (web)}
@@ -39,7 +39,7 @@
 osem_boxes = function (exposure = NA, model = NA, grouptag = NA,
                       date = NA, from = NA, to = NA, phenomenon = NA,
                       endpoint = osem_endpoint(),
-                      progress = T) {
+                      progress = TRUE) {
 
   # error, if phenomenon, but no time given
   if (!is.na(phenomenon) && is.na(date) && is.na(to) && is.na(from))
diff --git a/R/measurement.R b/R/measurement.R
index fd12197..666fea3 100644
--- a/R/measurement.R
+++ b/R/measurement.R
@@ -18,7 +18,7 @@
 #' @param exposure Filter sensors by their exposure ('indoor', 'outdoor', 'mobile')
 #' @param from A \code{POSIXt} like object to select a time interval
 #' @param to A \code{POSIXt} like object to select a time interval
-#' @param columns Select specific column in the output (see oSeM documentation)
+#' @param columns Select specific column in the output (see openSenseMap API documentation)
 #' @param endpoint The URL of the openSenseMap API
 #' @param progress Whether to print download progress information
 #'
@@ -130,7 +130,7 @@ parse_get_measurements_params = function (params) {
   }
 
   if (!is.na(params$exposure)) query$exposure = params$exposure
-  if (!is.na(params$columns))
+  if (!any(is.na(params$columns)))
     query$columns = paste(params$columns, collapse = ',')
   else
     query$columns = 'value,createdAt,lon,lat,sensorId,unit'
diff --git a/man/opensensmapr.Rd b/man/opensensmapr.Rd
index 72ddee2..1cd5da0 100644
--- a/man/opensensmapr.Rd
+++ b/man/opensensmapr.Rd
@@ -91,3 +91,12 @@ openSenseMap API: \url{https://api.opensensemap.org/}
 
 official openSenseMap API documentation: \url{https://docs.opensensemap.org/}
 }
+\author{
+\strong{Maintainer}: Norwin Roosen \email{bugs@nroo.de}
+
+Other contributors:
+\itemize{
+  \item Daniel Nuest \email{daniel.nuest@uni-muenster.de} (0000-0003-2392-6140) [contributor]
+}
+
+}
diff --git a/man/osem_measurements.Rd b/man/osem_measurements.Rd
index d30b809..8b1535d 100644
--- a/man/osem_measurements.Rd
+++ b/man/osem_measurements.Rd
@@ -37,7 +37,7 @@ osem_measurements(x, ...)
 
 \item{to}{A \code{POSIXt} like object to select a time interval}
 
-\item{columns}{Select specific column in the output (see oSeM documentation)}
+\item{columns}{Select specific column in the output (see openSenseMap API documentation)}
 
 \item{endpoint}{The URL of the openSenseMap API}
 
diff --git a/tests/testthat/test_boxes.R b/tests/testthat/test_boxes.R
index 79b8fd0..ccc4915 100644
--- a/tests/testthat/test_boxes.R
+++ b/tests/testthat/test_boxes.R
@@ -63,7 +63,7 @@ test_that("a response with no matches returns empty sensebox data.frame and a wa
 test_that("a response with no matches gives a warning", {
   check_api()
   
-  expect_warning(osem_boxes(grouptag = "does_not_exist"), "no boxes found")
+  expect_warning(osem_boxes(grouptag = "does_not_exist"), "no senseBoxes found")
 })
 
 test_that("data.frame can be converted to sensebox data.frame", {