diff --git a/DESCRIPTION b/DESCRIPTION
index 991c035cd522830ad2bc7c2172ade926b98c621b..7fed68021946dbf07230a3294d0517ba16b350f9 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Package: splatter
 Type: Package
 Title: Simple Simulation of Single-cell RNA Sequencing Data
-Version: 0.99.5
-Date: 2016-12-28
+Version: 0.99.6
+Date: 2016-12-29
 Author: Luke Zappia
 Authors@R:
     c(person("Luke", "Zappia", role = c("aut", "cre"),
diff --git a/NAMESPACE b/NAMESPACE
index 9d8ff06b6fb355c1db6dbacc91028090c4d9aeec..0bfc62ec954c7c9f3d854b6de40e1955408efa87 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -90,5 +90,4 @@ importFrom(stats,rnbinom)
 importFrom(stats,rnorm)
 importFrom(stats,rpois)
 importFrom(stats,runif)
-importFrom(utils,data)
 importFrom(utils,head)
diff --git a/NEWS.md b/NEWS.md
index 66bfb920c4ff693f676bbd78877e475b7080bbbf..b09c356dd433beb5171a8051047ae6ae4fb89a4f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+# 0.99.6
+
+* Add installation to vignette
+* Add detail about counts matrix to vignette
+* Replace 1:x with seq_len/seq_along
+
 # 0.99.5
 
 * Set R_TESTS environment
diff --git a/R/SCDDParams-methods.R b/R/SCDDParams-methods.R
index 57eb760ab22b92ea961ae1adbb9dea04e8906163..2ff85433903db5d82dbbe9dc8735dde3f22144d5 100644
--- a/R/SCDDParams-methods.R
+++ b/R/SCDDParams-methods.R
@@ -1,15 +1,13 @@
 #' @rdname newParams
-#' @importFrom utils data
 #' @importFrom methods new
 #' @export
 newSCDDParams <- function(...) {
 
     if (!requireNamespace("scDD", quietly = TRUE)) {
-        stop("The scDD simulation requires the 'scDD' package. ",
-             "See https://github.com/kdkorthauer/scDD for installation.")
+        stop("The scDD simulation requires the 'scDD' package.")
     }
 
-    data("scDatEx", package = "scDD", envir = environment())
+    utils::data("scDatEx", package = "scDD", envir = environment())
 
     params <- new("SCDDParams", SCdat = scDatEx)
 
diff --git a/R/scDD-estimate.R b/R/scDD-estimate.R
index a4e9fa89dc74507b5b42bb4ff798860a1b51b9c0..8f9a5c20725c120fa638ddf7af12099f271e002d 100644
--- a/R/scDD-estimate.R
+++ b/R/scDD-estimate.R
@@ -38,8 +38,7 @@ scDDEstimate.SCESet <- function(counts, conditions, params = newSCDDParams()) {
 scDDEstimate.matrix <- function(counts, conditions, params = newSCDDParams()) {
 
     if (!requireNamespace("scDD", quietly = TRUE)) {
-        stop("The scDD simulation requires the 'scDD' package. ",
-             "See https://github.com/kdkorthauer/scDD for installation.")
+        stop("The scDD simulation requires the 'scDD' package.")
     }
 
     checkmate::assertClass(params, "SCDDParams")
diff --git a/appveyor.yml b/appveyor.yml
index 6ae614c72e680ca8da2af5b3bb4c2bd4af694eda..af7524cc373e24ad02a29d1602a955183e0d74e3 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,6 +12,12 @@ install:
 
 # Adapt as necessary starting from here
 
+environment:
+    matrix:
+    - R_VERSION: devel
+
+    - R_VERSION: release
+
 build_script:
   - travis-tool.sh install_bioc_deps