diff --git a/DESCRIPTION b/DESCRIPTION
index 2b2edea580c30293b9f01b79dbd488e439dbe50b..6cd7cfb2a6620420e309c658103aa0740995b7cb 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Package: stressaddition
 Type: Package
 Title: Modelling Tri-Phasic Concentration-Response Relationships
-Version: 3.0.0
-Date: 2020-07-06
+Version: 3.0.1
+Date: 2020-07-28
 Authors@R: c(person("Sebastian", 
                     "Henz", 
                     role = c("aut", "cre"), 
diff --git a/R/plot_ecxsys.R b/R/plot_ecxsys.R
index 6d1ec9e34451680935058371829b96bd8f0c268d..15658e9cff2f3b1c175c3078d681263e43aa55bf 100644
--- a/R/plot_ecxsys.R
+++ b/R/plot_ecxsys.R
@@ -40,6 +40,8 @@
 #'   the number of elements shown.
 #' @param xlab,ylab,main Axis labels and title.
 #'
+#' @return None
+#'
 #' @examples model <- ecxsys(
 #'     concentration = c(0, 0.05, 0.5, 5, 30),
 #'     hormesis_concentration = 0.5,
diff --git a/R/plot_stress.R b/R/plot_stress.R
index 1d702a9e55951ae3508bd7bc9afa9fa83c14cfe0..52cce5b4f0369bbfeb4751a626ba29cf098beb24 100644
--- a/R/plot_stress.R
+++ b/R/plot_stress.R
@@ -194,4 +194,5 @@ plot_stress <- function(model,
             )
         }
     }
+    NULL  # suppress all possible return values
 }
diff --git a/R/plot_survival.R b/R/plot_survival.R
index 7963504d254cb2f59f6f78a7426e442b4b67930b..39a761346b02cc97f5ad641430415530114dc47e 100644
--- a/R/plot_survival.R
+++ b/R/plot_survival.R
@@ -175,4 +175,5 @@ plot_survival <- function(model,
             )
         }
     }
+    NULL  # suppress all possible return values
 }
diff --git a/R/stress_survival_conversion.R b/R/stress_survival_conversion.R
index 50e614e5c69ce1b7f3cf6085831623bc5531bb99..3a81e32033686305fa4b00646f85116fd7c0ce04 100644
--- a/R/stress_survival_conversion.R
+++ b/R/stress_survival_conversion.R
@@ -24,9 +24,7 @@
 #'
 #' These are simple wrappers around the beta distribution function
 #' \code{\link[stats:Beta]{pbeta}} and the beta quantile function
-#' \code{\link[stats:Beta]{qbeta}}. \code{stress_to_survival} returns \code{1 -
-#' pbeta(stress, p, q)}. \code{survival_to_stress} first clamps the survival to
-#' the interval [0, 1] and then returns \code{qbeta(1 - survival, p, q)}.
+#' \code{\link[stats:Beta]{qbeta}}.
 #'
 #' @name Stressconversion
 #'
@@ -37,6 +35,12 @@
 #' @param p,q The shape parameters of the \code{\link[stats:Beta]{beta}}
 #'   distribution. Default is 3.2.
 #'
+#' @return \code{stress_to_survival} returns a vector the same length as
+#'   \code{stress} giving the survival caused by each amount of stress.
+#'
+#'   \code{survival_to_stress} returns a vector the same length as
+#'   \code{survival} containing the stress values associated with each survival.
+#'
 #' @examples
 #' stress <- 0.3
 #' survival <- stress_to_survival(stress)
diff --git a/man/Stressconversion.Rd b/man/Stressconversion.Rd
index 6ffa537701abbb8b4f7db273daad581df20f31c3..df183764e8fb8ae74c6ba078f4dd57c6b4a5324a 100644
--- a/man/Stressconversion.Rd
+++ b/man/Stressconversion.Rd
@@ -20,6 +20,13 @@ distribution. Default is 3.2.}
 
 \item{stress}{One or more stress values to convert to survival.}
 }
+\value{
+\code{stress_to_survival} returns a vector the same length as
+  \code{stress} giving the survival caused by each amount of stress.
+
+  \code{survival_to_stress} returns a vector the same length as
+  \code{survival} containing the stress values associated with each survival.
+}
 \description{
 Functions to convert survival to general stress or vice versa using the beta
 distribution.
@@ -27,9 +34,7 @@ distribution.
 \details{
 These are simple wrappers around the beta distribution function
 \code{\link[stats:Beta]{pbeta}} and the beta quantile function
-\code{\link[stats:Beta]{qbeta}}. \code{stress_to_survival} returns \code{1 -
-pbeta(stress, p, q)}. \code{survival_to_stress} first clamps the survival to
-the interval [0, 1] and then returns \code{qbeta(1 - survival, p, q)}.
+\code{\link[stats:Beta]{qbeta}}.
 }
 \examples{
 stress <- 0.3
diff --git a/man/plot_ecxsys.Rd b/man/plot_ecxsys.Rd
index d5c09b0a90d2d9991fb4f8a37617ad5e04101718..ae35a65c5a37a28bb4a30f6cb7a0d49995113422 100644
--- a/man/plot_ecxsys.Rd
+++ b/man/plot_ecxsys.Rd
@@ -42,6 +42,9 @@ the number of elements shown.}
 
 \item{xlab, ylab, main}{Axis labels and title.}
 }
+\value{
+None
+}
 \description{
 Plot the observed and modeled survivals and stresses.
 }