diff --git a/R/check_args_default.R b/R/check_args_default.R
index 442b6029..2203a19e 100644
--- a/R/check_args_default.R
+++ b/R/check_args_default.R
@@ -1,8 +1,9 @@
-#' @title Prepare arguments to default epidemic function
+#' @title Prepare arguments to default model function
 #' @name prepare_default_args
 #' @rdname prepare_default_args
 #'
-#' @description Prepare arguments to for [.model_default_cpp()].
+#' @description Prepare arguments to [model_default_cpp()] for
+#' [.model_default_cpp()].
 #'
 #' @param mod_args A named list of the population, and epidemic modifiers.
 #'
diff --git a/R/check_args_diphtheria.R b/R/check_args_diphtheria.R
index afbfa173..782f8ad9 100644
--- a/R/check_args_diphtheria.R
+++ b/R/check_args_diphtheria.R
@@ -3,7 +3,7 @@
 #' @rdname prepare_diphtheria_args
 #'
 #' @description Prepare arguments to [model_diphtheria_cpp()] for
-#' [.model_default_cpp()].
+#' [.model_diphtheria_cpp()].
 #'
 #' @param mod_args A named list of the population, and epidemic modifiers.
 #'
@@ -50,7 +50,7 @@
 #' @keywords internal
 #' @details
 #' `.check_prepare_args_diphtheria()` prepares arguments for
-#' [.model_diphtheria_cpp()], which is the C++ function that solves the default
+#' [.model_diphtheria_cpp()], which is the C++ function that solves the
 #' ODE system using a Boost _odeint_ solver, by converting the arguments
 #' collected in `mod_args` into simpler structures such as lists and numeric or
 #' integer vectors that can be interpreted as C++ types such as `Rcpp::List`,
diff --git a/man/prepare_default_args.Rd b/man/prepare_default_args.Rd
index fd2a7449..e619d6ab 100644
--- a/man/prepare_default_args.Rd
+++ b/man/prepare_default_args.Rd
@@ -3,7 +3,7 @@
 \name{prepare_default_args}
 \alias{prepare_default_args}
 \alias{.check_prepare_args_default}
-\title{Prepare arguments to default epidemic function}
+\title{Prepare arguments to default model function}
 \usage{
 .check_prepare_args_default(mod_args)
 }
@@ -34,7 +34,8 @@ is incremented.
 }
 }
 \description{
-Prepare arguments to for \code{\link[=.model_default_cpp]{.model_default_cpp()}}.
+Prepare arguments to \code{\link[=model_default_cpp]{model_default_cpp()}} for
+\code{\link[=.model_default_cpp]{.model_default_cpp()}}.
 }
 \details{
 \code{.check_prepare_args_default()} prepares arguments for
diff --git a/man/prepare_diphtheria_args.Rd b/man/prepare_diphtheria_args.Rd
new file mode 100644
index 00000000..1eff777d
--- /dev/null
+++ b/man/prepare_diphtheria_args.Rd
@@ -0,0 +1,56 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/check_args_diphtheria.R
+\name{prepare_diphtheria_args}
+\alias{prepare_diphtheria_args}
+\alias{.check_prepare_args_diphtheria}
+\title{Prepare arguments to diphtheria model function}
+\usage{
+.check_prepare_args_diphtheria(mod_args)
+}
+\arguments{
+\item{mod_args}{A named list of the population, and epidemic modifiers.}
+}
+\value{
+A list of model arguments suitable for \code{\link[=.model_diphtheria_cpp]{.model_diphtheria_cpp()}}.
+This is a named list consisting of:
+\itemize{
+\item \code{initial_state}: the initial conditions modified to represent absolute
+rather than proportional values;
+\item \code{transmissibility}, \code{transmissibility_vax}: two numbers representing the
+transmission rate
+of the infection for unvaccinated or single-dose vaccinated, and two-dose
+vaccinated individuals, respectively;
+\item \code{infectiousness_rate}: a single number for the transition rate from the
+'exposed' and 'exposed_vaccinated' to the 'infectious' and
+'infectious_vaccinated' compartments;
+\item \code{recovery_rate}: a single number for the recovery rate from the infection;
+\item \code{reporting_rate}: a single number for the proportion of infectious cases
+reported;
+\item \code{prop_hosp}: a single number for the proportion of reported cases that
+need hospitalisation;
+\item \code{hosp_entry_rate}, \code{hosp_exit_rate}: two numbers representing the rate of
+entry and exit from the 'hospitalised' compartment;
+\item \code{rate_interventions}: an Rcpp List giving the interventions on model
+parameters;
+\item \code{time_dependence}: an Rcpp List giving the time-dependent effects on model
+parameters in the form of R functions;
+\item \code{pop_change_times} and \code{pop_change_values}: the times and values of changes
+in the population of susceptibles;
+\item \code{time_end}, \code{increment}: two numbers for the time at which to end the
+simulation, and the value by which the simulation time
+is incremented.
+}
+}
+\description{
+Prepare arguments to \code{\link[=model_diphtheria_cpp]{model_diphtheria_cpp()}} for
+\code{\link[=.model_default_cpp]{.model_default_cpp()}}.
+}
+\details{
+\code{.check_prepare_args_diphtheria()} prepares arguments for
+\code{\link[=.model_diphtheria_cpp]{.model_diphtheria_cpp()}}, which is the C++ function that solves the default
+ODE system using a Boost \emph{odeint} solver, by converting the arguments
+collected in \code{mod_args} into simpler structures such as lists and numeric or
+integer vectors that can be interpreted as C++ types such as \code{Rcpp::List},
+\code{Rcpp::NumericVector}, or \code{Eigen::MatrixXd}.
+}
+\keyword{internal}