diff --git a/DESCRIPTION b/DESCRIPTION
index 3153dc6..68e89ee 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -11,7 +11,7 @@ Description: A simple way of fitting detection functions to distance sampling
     Horvitz-Thompson-like estimator) if survey area information is provided.
 Version: 0.9.4
 URL: http://github.com/DistanceDevelopment/Distance/
-Date: 2015-02-03
+Date: 2015-07-08
 Depends:
     R (>= 3.0),
     mrds (>= 2.1.10)
diff --git a/NAMESPACE b/NAMESPACE
index cc3d2d7..9c14645 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -8,3 +8,6 @@ export(create.bins)
 export(ds)
 export(ds.gof)
 import(mrds)
+importFrom(graphics,plot)
+importFrom(stats,as.formula)
+importFrom(stats,quantile)
diff --git a/R/ds.R b/R/ds.R
index b78738b..5ffbf63 100644
--- a/R/ds.R
+++ b/R/ds.R
@@ -136,6 +136,7 @@
 #' @seealso \code{\link{flatfile}}
 #' @export
 #'
+#' @importFrom stats quantile as.formula
 #' @references
 #' Buckland, S.T., Anderson, D.R., Burnham, K.P., Laake, J.L., Borchers, D.L., and Thomas, L. (2001). Distance Sampling. Oxford University Press. Oxford, UK.
 #'
diff --git a/R/plot.dsmodel.R b/R/plot.dsmodel.R
index 920f179..88cc3ff 100644
--- a/R/plot.dsmodel.R
+++ b/R/plot.dsmodel.R
@@ -9,6 +9,7 @@
 #' @aliases plot.dsmodel
 #' @export
 #' @author David L. Miller
+#' @importFrom graphics plot
 plot.dsmodel <- function(x,...){
 
   plot(x$ddf,...)