diff --git a/DESCRIPTION b/DESCRIPTION
index 267d56b1073b6ced9e1ff91eccff05746c7afa82..10ba84d937ac4a3210d321730e17346a2b58a402 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: splatter
 Type: Package
 Title: Simple Simulation of Single-cell RNA Sequencing Data
-Version: 0.4.2
+Version: 0.4.3
 Date: 2016-10-12
 Author: Luke Zappia
 Authors@R: as.person(c(
diff --git a/NAMESPACE b/NAMESPACE
index de53bdde528947822e297c2c44b5117ce3c81894..282ee47e95ec7074a8d83ee5bc61a686979eaa67 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -30,6 +30,7 @@ importFrom(stats,rbinom)
 importFrom(stats,rchisq)
 importFrom(stats,rgamma)
 importFrom(stats,rlnorm)
+importFrom(stats,rnbinom)
 importFrom(stats,rnorm)
 importFrom(stats,rpois)
 importFrom(stats,runif)
diff --git a/R/simulate-simple.R b/R/simulate-simple.R
index 34c219b35945a4903f99c392cc0e86f41d53af86..0ab0704df4814a1a6c4df7b1be9a01a5f5e0c67e 100644
--- a/R/simulate-simple.R
+++ b/R/simulate-simple.R
@@ -23,6 +23,7 @@
 #' @examples
 #' sim <- simSimple()
 #' @export
+#' @importFrom stats rgamma rnbinom
 simSimple <- function(params = defaultParams(), verbose = TRUE, ...) {
 
     if (verbose) {message("Getting parameters...")}
diff --git a/tests/testthat/test-simulate-simple.R b/tests/testthat/test-simulate-simple.R
new file mode 100644
index 0000000000000000000000000000000000000000..832c34d91f771e0b6fe3a8adcde5305ca2bde9fe
--- /dev/null
+++ b/tests/testthat/test-simulate-simple.R
@@ -0,0 +1,5 @@
+context("simple simulation")
+
+test_that("simple simulation output is valid", {
+  expect_true(validObject(simSimple()))
+})