diff --git a/R/constr.hclust-class.R b/R/constr.hclust-class.R
index c6d9e27..395e4e6 100644
--- a/R/constr.hclust-class.R
+++ b/R/constr.hclust-class.R
@@ -60,4 +60,6 @@
 #' 
 #' @seealso \code{\link{hclust}-class}
 #' 
+#' @returns No return value
+#' 
 NULL
diff --git a/R/listw.explore.R b/R/listw.explore.R
index c36d155..d9fe827 100644
--- a/R/listw.explore.R
+++ b/R/listw.explore.R
@@ -4,6 +4,7 @@
 #' @importFrom shiny runApp
 #' @author Stéphane Dray \email{stephane.dray@@univ-lyon1.fr}
 #' @seealso \code{\link{chooseCN}}
+#' @returns No return value
 #' @examples
 #' \dontrun{
 #' ## a matrix or an object of class 'Spatial*' should be in the global environment
diff --git a/R/msr.mantelrtest.R b/R/msr.mantelrtest.R
index e34f1b8..0a13fdf 100644
--- a/R/msr.mantelrtest.R
+++ b/R/msr.mantelrtest.R
@@ -16,7 +16,7 @@
 #' @param method an character specifying which algorithm should be used to
 #'   produce spatial replicates (see \code{\link{msr.default}}).
 #' @param \dots further arguments of the \code{\link{msr.default}} function.
-#' @return An object of class \code{randtest}.
+#' @returns An object of class \code{randtest}.
 #' @author Sylvie Clappe, Stephane Dray \email{stephane.dray@@univ-lyon1.fr}
 #' @seealso \code{\link{msr.default}}, \code{\link[ade4]{mantel.randtest}}
 #' @references Crabot, J., Clappe, S., Dray, S. and Datry, T. (2019) Testing the
diff --git a/R/plot.constr.hclust.R b/R/plot.constr.hclust.R
index 332ec7a..433b5e6 100644
--- a/R/plot.constr.hclust.R
+++ b/R/plot.constr.hclust.R
@@ -111,7 +111,7 @@
 #' 
 #' @author Guillaume Guénard \email{guillaume.guenard@umontreal.ca}
 #' and Pierre Legendre \email{pierre.legendre@@umontreal.ca}
-#' 
+#' @returns No return value
 #' @examples
 #' 
 #' ## Artificial map data from Legendre & Legendre (2012, Fig. 13.26)