diff --git a/R/SpatialLinesToWKBLineString.R b/R/SpatialLinesToWKBLineString.R
index 9a351ae..0787728 100644
--- a/R/SpatialLinesToWKBLineString.R
+++ b/R/SpatialLinesToWKBLineString.R
@@ -165,7 +165,7 @@ SpatialLinesToWKBLineString <- function(obj) {
 #' @param obj an object of class
 #'   \code{\link[sp:SpatialLines-class]{SpatialLines}} or
 #'   \code{\link[sp:SpatialLinesDataFrame-class]{SpatialLinesDataFrame}}.
-#' @param centerfun the function to apply to the x-axis limits and y-axis limits
+#' @param centerfun function to apply to the x-axis limits and y-axis limits
 #'   of the bounding box to obtain the x-coordinate and y-coordinate of the
 #'   center of the bounding box.
 #' @return A data frame with six columns named XMax, XMin, YMax, YMin, XCenter,
diff --git a/R/SpatialPointsToWKBPoint.R b/R/SpatialPointsToWKBPoint.R
index c6e7b08..8cd93dd 100644
--- a/R/SpatialPointsToWKBPoint.R
+++ b/R/SpatialPointsToWKBPoint.R
@@ -146,7 +146,7 @@ SpatialPointsToWKBPoint <- function(obj) {
 #' @param obj an object of class
 #'   \code{\link[sp:SpatialPoints-class]{SpatialPoints}} or
 #'   \code{\link[sp:SpatialPointsDataFrame-class]{SpatialPointsDataFrame}}.
-#' @param centerfun the function to apply to the x-axis limits and y-axis limits
+#' @param centerfun function to apply to the x-axis limits and y-axis limits
 #'   of the bounding box to obtain the x-coordinate and y-coordinate of the
 #'   center of the bounding box.
 #' @return A data frame with six columns named XMax, XMin, YMax, YMin, XCenter,
diff --git a/R/writeEnvelope.R b/R/writeEnvelope.R
index c75139d..07e64d7 100644
--- a/R/writeEnvelope.R
+++ b/R/writeEnvelope.R
@@ -16,7 +16,7 @@
 #'   or a \code{list} in which each element is an object of class
 #'   \code{\link[sp:SpatialPoints-class]{SpatialPoints}} or
 #'   \code{\link[sp:SpatialPointsDataFrame-class]{SpatialPointsDataFrame}}.
-#' @param centerfun the function to apply to the x-axis limits and y-axis limits
+#' @param centerfun function to apply to the x-axis limits and y-axis limits
 #'   of the bounding box to obtain the x-coordinate and y-coordinate of the
 #'   center of the bounding box.
 #' @return A data frame with six columns named XMax, XMin, YMax, YMin, XCenter,
diff --git a/man/writeEnvelope.Rd b/man/writeEnvelope.Rd
index 94c2a7f..9dda89b 100644
--- a/man/writeEnvelope.Rd
+++ b/man/writeEnvelope.Rd
@@ -9,7 +9,7 @@ writeEnvelope(obj, centerfun = mean)
 \arguments{
 \item{obj}{object inheriting class \code{\link[sp:Spatial-class]{Spatial}}.}
 
-\item{centerfun}{the function to apply to the x-axis limits and y-axis limits
+\item{centerfun}{function to apply to the x-axis limits and y-axis limits
 of the bounding box to obtain the x-coordinate and y-coordinate of the
 center of the bounding box.}
 }