diff --git a/DESCRIPTION b/DESCRIPTION
index f6a61a8..1a8e12a 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -8,6 +8,6 @@ Description: Peter Henderson's Functional Geometry in R.
 License: MIT + file LICENSE
 Imports:
     grid
-RoxygenNote: 5.0.1
+RoxygenNote: 7.2.3
 URL: https://github.com/mhenderson/funcgeo
 BugReports: https://github.com/mhenderson/funcgeo/issues
diff --git a/R/above-grob.R b/R/above-grob.R
index f148baf..964e259 100644
--- a/R/above-grob.R
+++ b/R/above-grob.R
@@ -1,5 +1,6 @@
 #' Superimpose two grobs, one above the other.
 #'
+#' @param p A grob
 #' @param q Another grob
 #' @param m An integer
 #' @param n Another integer
diff --git a/R/above.R b/R/above.R
index 6cfa008..af93c09 100644
--- a/R/above.R
+++ b/R/above.R
@@ -1,8 +1,11 @@
 #' Superimpose two pictures, one above the other.
 #'
 #' @param p A picture
+#' @param q Another picture
+#' @param m An integer
+#' @param n Another integer
 #' @return A picture
 #' @export
-above <- function(picture, ...) {
-  UseMethod("above", picture)
+above <- function(p, q, m, n) {
+  UseMethod("above")
 }
diff --git a/R/beside-grob.R b/R/beside-grob.R
index 4e05883..c7c9834 100644
--- a/R/beside-grob.R
+++ b/R/beside-grob.R
@@ -1,6 +1,9 @@
 #' Superimpose two grobs side-by-side.
 #'
-#' @param g grob
+#' @param p grob
+#' @param q grob
+#' @param m An integer
+#' @param n Another integer
 #' @return A grob
 #' @export
 beside.grob <- function(p, q, m = 1, n = 1) {
diff --git a/R/beside.R b/R/beside.R
index eefe11d..ee5f837 100644
--- a/R/beside.R
+++ b/R/beside.R
@@ -1,8 +1,12 @@
 #' Superimpose two grobs, side-by-side.
 #'
-#' @param p A picture
+#' @param p grob
+#' @param q grob
+#' @param m An integer
+#' @param n Another integer
+#' @return A grob
 #' @return A picture
 #' @export
-beside <- function(picture, ...) {
-  UseMethod("beside", picture)
+beside <- function(p, q, m = 1, n = 1) {
+  UseMethod("beside", p)
 }
diff --git a/R/cycle.R b/R/cycle.R
index 3182dda..ce44549 100644
--- a/R/cycle.R
+++ b/R/cycle.R
@@ -1,7 +1,7 @@
 #' Cycle
 #'
-#' @param g grob
-#' @return A grob
+#' @param p A picture
+#' @return A picture
 #' @export
 cycle <- function(p) {
   return(quartet(p, rot(rot(rot(p))), rot(p), rot(rot(p))))
diff --git a/R/flip.R b/R/flip.R
index 885334d..2069526 100644
--- a/R/flip.R
+++ b/R/flip.R
@@ -1,8 +1,8 @@
 #' Flip a picture.
 #'
-#' @param picture A picture
+#' @param g A picture
 #' @return Flipped picture
 #' @export
-flip <- function(picture, ...) {
-  UseMethod("flip", picture)
+flip <- function(g) {
+  UseMethod("flip", g)
 }
diff --git a/R/plot-picture.R b/R/plot-picture.R
index a02e3c2..e1e4b23 100644
--- a/R/plot-picture.R
+++ b/R/plot-picture.R
@@ -1,8 +1,9 @@
 #' plot.picture
 #'
-#' @param picture A picture
+#' @param x A picture
+#' @param ... Anything else.
 #' @return grid.draw(picture)
 #' @export
-plot.picture <- function(picture) {
-  grid::grid.draw(picture)
+plot.picture <- function(x, ...) {
+  grid::grid.draw(x)
 }
diff --git a/R/rot-grob.R b/R/rot-grob.R
index 19c4767..97a84b3 100644
--- a/R/rot-grob.R
+++ b/R/rot-grob.R
@@ -1,6 +1,7 @@
 #' Rotate a grob.
 #'
 #' @param g A grob
+#' @param angle An angle
 #' @return Rotated grob
 #' @export
 rot.grob <- function(g, angle = 90) {
diff --git a/R/rot.R b/R/rot.R
index 067edca..efe7da8 100644
--- a/R/rot.R
+++ b/R/rot.R
@@ -1,8 +1,9 @@
 #' Rotate a picture.
 #'
-#' @param picture A picture
+#' @param g A picture
+#' @param angle An angle
 #' @return Rotated picture
 #' @export
-rot <- function(picture, ...) {
-  UseMethod("rot", picture)
+rot <- function(g, angle) {
+  UseMethod("rot", g)
 }
diff --git a/man/above.Rd b/man/above.Rd
index dec9cb6..7156132 100644
--- a/man/above.Rd
+++ b/man/above.Rd
@@ -4,10 +4,16 @@
 \alias{above}
 \title{Superimpose two pictures, one above the other.}
 \usage{
-above(picture, ...)
+above(p, q, m, n)
 }
 \arguments{
 \item{p}{A picture}
+
+\item{q}{Another picture}
+
+\item{m}{An integer}
+
+\item{n}{Another integer}
 }
 \value{
 A picture
@@ -15,4 +21,3 @@ A picture
 \description{
 Superimpose two pictures, one above the other.
 }
-
diff --git a/man/above.grob.Rd b/man/above.grob.Rd
index 10ec5c8..19ed06f 100644
--- a/man/above.grob.Rd
+++ b/man/above.grob.Rd
@@ -7,6 +7,8 @@
 \method{above}{grob}(p, q, m = 1, n = 1)
 }
 \arguments{
+\item{p}{A grob}
+
 \item{q}{Another grob}
 
 \item{m}{An integer}
@@ -19,4 +21,3 @@ A new grob obtained by superimposing p and q, one above the other.
 \description{
 Superimpose two grobs, one above the other.
 }
-
diff --git a/man/beside.Rd b/man/beside.Rd
index d39d936..e963a18 100644
--- a/man/beside.Rd
+++ b/man/beside.Rd
@@ -4,15 +4,22 @@
 \alias{beside}
 \title{Superimpose two grobs, side-by-side.}
 \usage{
-beside(picture, ...)
+beside(p, q, m = 1, n = 1)
 }
 \arguments{
-\item{p}{A picture}
+\item{p}{grob}
+
+\item{q}{grob}
+
+\item{m}{An integer}
+
+\item{n}{Another integer}
 }
 \value{
+A grob
+
 A picture
 }
 \description{
 Superimpose two grobs, side-by-side.
 }
-
diff --git a/man/beside.grob.Rd b/man/beside.grob.Rd
index ca6e8ea..4007704 100644
--- a/man/beside.grob.Rd
+++ b/man/beside.grob.Rd
@@ -7,7 +7,13 @@
 \method{beside}{grob}(p, q, m = 1, n = 1)
 }
 \arguments{
-\item{g}{grob}
+\item{p}{grob}
+
+\item{q}{grob}
+
+\item{m}{An integer}
+
+\item{n}{Another integer}
 }
 \value{
 A grob
@@ -15,4 +21,3 @@ A grob
 \description{
 Superimpose two grobs side-by-side.
 }
-
diff --git a/man/cycle.Rd b/man/cycle.Rd
index 283d9cc..35f3bec 100644
--- a/man/cycle.Rd
+++ b/man/cycle.Rd
@@ -7,12 +7,11 @@
 cycle(p)
 }
 \arguments{
-\item{g}{grob}
+\item{p}{A picture}
 }
 \value{
-A grob
+A picture
 }
 \description{
 Cycle
 }
-
diff --git a/man/flip.Rd b/man/flip.Rd
index 05ab865..8d36393 100644
--- a/man/flip.Rd
+++ b/man/flip.Rd
@@ -4,10 +4,10 @@
 \alias{flip}
 \title{Flip a picture.}
 \usage{
-flip(picture, ...)
+flip(g)
 }
 \arguments{
-\item{picture}{A picture}
+\item{g}{A picture}
 }
 \value{
 Flipped picture
@@ -15,4 +15,3 @@ Flipped picture
 \description{
 Flip a picture.
 }
-
diff --git a/man/flip.grob.Rd b/man/flip.grob.Rd
index b6bb4ae..20df25a 100644
--- a/man/flip.grob.Rd
+++ b/man/flip.grob.Rd
@@ -15,4 +15,3 @@ Flipped grob
 \description{
 Flip a grob.
 }
-
diff --git a/man/nonet.Rd b/man/nonet.Rd
index 21a68e6..1919a48 100644
--- a/man/nonet.Rd
+++ b/man/nonet.Rd
@@ -31,4 +31,3 @@ A grob
 \description{
 Nonet
 }
-
diff --git a/man/plot.picture.Rd b/man/plot.picture.Rd
index 0326f3b..85d45db 100644
--- a/man/plot.picture.Rd
+++ b/man/plot.picture.Rd
@@ -4,10 +4,12 @@
 \alias{plot.picture}
 \title{plot.picture}
 \usage{
-\method{plot}{picture}(picture)
+\method{plot}{picture}(x, ...)
 }
 \arguments{
-\item{picture}{A picture}
+\item{x}{A picture}
+
+\item{...}{Anything else.}
 }
 \value{
 grid.draw(picture)
@@ -15,4 +17,3 @@ grid.draw(picture)
 \description{
 plot.picture
 }
-
diff --git a/man/quartet.Rd b/man/quartet.Rd
index 56b51bf..020bbd4 100644
--- a/man/quartet.Rd
+++ b/man/quartet.Rd
@@ -21,4 +21,3 @@ A grob
 \description{
 Quartet
 }
-
diff --git a/man/rot.Rd b/man/rot.Rd
index cb9a5a8..1d3b486 100644
--- a/man/rot.Rd
+++ b/man/rot.Rd
@@ -4,10 +4,12 @@
 \alias{rot}
 \title{Rotate a picture.}
 \usage{
-rot(picture, ...)
+rot(g, angle)
 }
 \arguments{
-\item{picture}{A picture}
+\item{g}{A picture}
+
+\item{angle}{An angle}
 }
 \value{
 Rotated picture
@@ -15,4 +17,3 @@ Rotated picture
 \description{
 Rotate a picture.
 }
-
diff --git a/man/rot.grob.Rd b/man/rot.grob.Rd
index d4e15f2..557fe4b 100644
--- a/man/rot.grob.Rd
+++ b/man/rot.grob.Rd
@@ -8,6 +8,8 @@
 }
 \arguments{
 \item{g}{A grob}
+
+\item{angle}{An angle}
 }
 \value{
 Rotated grob
@@ -15,4 +17,3 @@ Rotated grob
 \description{
 Rotate a grob.
 }
-