diff --git a/R/images.R b/R/images.R
index fe51ac3..c753653 100644
--- a/R/images.R
+++ b/R/images.R
@@ -18,6 +18,7 @@
 #' @examples \dontrun{
 #' curl::curl_download('https://jeroen.github.io/images/blackbear.mp4', 'blackbear.mp4')
 #' av_video_images('blackbear.mp4', fps = 1, trim = "10:20")
+#' stop("This should error")
 #' }
 av_video_images <- function(video, destdir = tempfile(), format = 'jpg', fps = NULL, trim = NULL){
   stopifnot(length(video) == 1)
diff --git a/man/av_video_images.Rd b/man/av_video_images.Rd
index e17e231..aa53ac0 100644
--- a/man/av_video_images.Rd
+++ b/man/av_video_images.Rd
@@ -38,5 +38,6 @@ will output one image for every 5 sec of video.
 \dontrun{
 curl::curl_download('https://jeroen.github.io/images/blackbear.mp4', 'blackbear.mp4')
 av_video_images('blackbear.mp4', fps = 1, trim = "10:20")
+stop("This should error")
 }
 }