diff --git a/NEWS.md b/NEWS.md
index 98888b4916aca1bfd308f87f5b32912fd50aa86f..1422585239b1beed70fed21003379295b3ea2324 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,7 +12,7 @@
 * Fixed some errors in the documentation and improved the examples.
 
 ## New
-* Exporte function `log10_ticks()` for calculating tick mark labels and positions on a base 10 logarithmic axis.
+* Export function `log10_ticks()` for calculating tick mark labels and positions on a base 10 logarithmic axis.
 * Add example data set `multiple_stress` for use with `multi_tox()`.
 * Various minor changes to prepare for CRAN submission.
 
diff --git a/R/data.R b/R/data.R
index bd310d9ccf356c0d5af5818d7499114c4d9fa991..eb8c1d8bd4dd1f2dbc27b45a6fa0bc299362c0f9 100644
--- a/R/data.R
+++ b/R/data.R
@@ -22,9 +22,10 @@
 
 #' Survival of Daphnia magna exposed to multiple stressors
 #'
-#' Individuals of Daphnia magna were exposed to combinations of food stress and
-#' multiple concentrations of the pesticides esfenvalerate and prochloraz.
-#' The survival was recorded at 21 days after contamination.
+#' A data set of mixture toxicity experiments. Individuals of Daphnia magna were
+#' exposed to combinations of food stress and multiple concentrations of the
+#' pesticides esfenvalerate and prochloraz. The survival was recorded at 21 days
+#' after contamination.
 #'
 #' @format A data frame with 58 rows and 4 variables:
 #' \describe{
diff --git a/R/multi_tox.R b/R/multi_tox.R
index 17b80a1bea8ad23ab2eeadac3be4056df6de25bc..97ae971924e26d36c6e8ca07f34c87d46583c292 100644
--- a/R/multi_tox.R
+++ b/R/multi_tox.R
@@ -25,11 +25,11 @@
 #'
 #' The predictions are symmetric, i.e. it does not matter which of the toxicant
 #' models is a or b as long as the concentration arguments are supplied in the
-#' same order. See the example below.
+#' same order.
 #'
-#' This method is only suitable for experiments without environmental stress.
-#' Any environmental stress supplied as arguments to \code{\link{ecxsys}} in
-#' \code{model_a} or \code{model_b} is ignored.
+#' This method is only suitable for experiments without or with low
+#' environmental stress. Any environmental stress supplied as arguments to
+#' \code{\link{ecxsys}} in \code{model_a} or \code{model_b} is ignored.
 #'
 #' @param model_a,model_b The ecxsys models of the toxicants.
 #' @param concentration_a,concentration_b The concentrations of the toxicants in
diff --git a/R/plot_ecxsys.R b/R/plot_ecxsys.R
index f0d9c0fe98259724df37fd854e2df0d20bee25de..6d1ec9e34451680935058371829b96bd8f0c268d 100644
--- a/R/plot_ecxsys.R
+++ b/R/plot_ecxsys.R
@@ -26,7 +26,7 @@
 #'
 #' @name plot_ecxsys
 #'
-#' @param model The list returned from \code{\link{ecxsys}}.
+#' @param model The object returned from \code{\link{ecxsys}}.
 #' @param which A vector of names to plot. Allowed are the column names of the
 #'   \code{model$curves} data frame. There is also
 #'   \code{"survival_tox_observed"} and \code{"survival_tox_env_observed"} for
diff --git a/man/multi_tox.Rd b/man/multi_tox.Rd
index b9c3db55bf5d3d2f603ec42fa9019ad946f4b91a..7abbb9fd1f38b4ab7559e596f676fd4bc1cae8aa 100644
--- a/man/multi_tox.Rd
+++ b/man/multi_tox.Rd
@@ -41,11 +41,11 @@ details.
 \details{
 The predictions are symmetric, i.e. it does not matter which of the toxicant
 models is a or b as long as the concentration arguments are supplied in the
-same order. See the example below.
+same order.
 
-This method is only suitable for experiments without environmental stress.
-Any environmental stress supplied as arguments to \code{\link{ecxsys}} in
-\code{model_a} or \code{model_b} is ignored.
+This method is only suitable for experiments without or with low
+environmental stress. Any environmental stress supplied as arguments to
+\code{\link{ecxsys}} in \code{model_a} or \code{model_b} is ignored.
 }
 \examples{
 # Using a data set which is included in this package. See ?multiple_stress
diff --git a/man/multiple_stress.Rd b/man/multiple_stress.Rd
index 685d8ae026aef602e97377ef80a399ccbb87942e..8667622d5138803f6d0c1c33163ac7dad14ea3ea 100644
--- a/man/multiple_stress.Rd
+++ b/man/multiple_stress.Rd
@@ -26,8 +26,9 @@ A data frame with 58 rows and 4 variables:
 multiple_stress
 }
 \description{
-Individuals of Daphnia magna were exposed to combinations of food stress and
-multiple concentrations of the pesticides esfenvalerate and prochloraz.
-The survival was recorded at 21 days after contamination.
+A data set of mixture toxicity experiments. Individuals of Daphnia magna were
+exposed to combinations of food stress and multiple concentrations of the
+pesticides esfenvalerate and prochloraz. The survival was recorded at 21 days
+after contamination.
 }
 \keyword{datasets}
diff --git a/man/plot_ecxsys.Rd b/man/plot_ecxsys.Rd
index 0cb31872ffcfee6f422434dd9080bec103211afd..d5c09b0a90d2d9991fb4f8a37617ad5e04101718 100644
--- a/man/plot_ecxsys.Rd
+++ b/man/plot_ecxsys.Rd
@@ -26,7 +26,7 @@ plot_survival(
 )
 }
 \arguments{
-\item{model}{The list returned from \code{\link{ecxsys}}.}
+\item{model}{The object returned from \code{\link{ecxsys}}.}
 
 \item{which}{A vector of names to plot. Allowed are the column names of the
 \code{model$curves} data frame. There is also