diff --git a/DESCRIPTION b/DESCRIPTION
index b612826..15c41de 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -9,7 +9,10 @@ Imports:
     httr,
     magrittr
 Suggests:
+    maps,
+    maptools,
     readr,
+    rgeos,
     sf,
     knitr,
     rmarkdown
diff --git a/R/box_utils.R b/R/box_utils.R
index 2fbe795..bc4e2c2 100644
--- a/R/box_utils.R
+++ b/R/box_utils.R
@@ -6,7 +6,7 @@ plot.sensebox = function (x, ..., mar = c(2,2,1,1)) {
     !requireNamespace("maptools", quietly = TRUE) ||
     !requireNamespace("rgeos", quietly = TRUE)
   ) {
-    stop('this functions requires the packages sf, maps, maptools, rgeos')
+    stop('this functions requires additional packages. install them with\n    install.packages(c("sf", "maps", "maptools", "rgeos"))')
   }
 
   geom = x %>%
@@ -15,7 +15,6 @@ plot.sensebox = function (x, ..., mar = c(2,2,1,1)) {
 
   bbox = sf::st_bbox(geom)
 
-  library(maps)
   world = maps::map('world', plot = FALSE, fill = TRUE) %>%
     sf::st_as_sf() %>%
     sf::st_geometry()