diff --git a/NEWS.md b/NEWS.md
index 29b8a2ebf..db23d478b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -26,6 +26,7 @@
 ## Documentation
 
 - Brought the docs on `alpha_sd` up to date with the code change from prior PR #853. By @zsusswein in #862 and reviewed by @jamesmbaazam.
+- The `...` argument in `estimate_secondary()` has been removed because it was not used. By @jamesmbaazam in #894 and reviewed by @.
 
 # EpiNow2 1.6.1
 
diff --git a/R/estimate_secondary.R b/R/estimate_secondary.R
index 09b635d7d..cd62bbd9f 100644
--- a/R/estimate_secondary.R
+++ b/R/estimate_secondary.R
@@ -58,8 +58,6 @@
 #' @param verbose Logical, should model fitting progress be returned. Defaults
 #' to [interactive()].
 #'
-#' @param ... Additional parameters to pass to [stan_opts()].
-#'
 #' @return A list containing: `predictions` (a `<data.frame>` ordered by date
 #' with the primary, and secondary observations, and a summary of the model
 #' estimated secondary observations), `posterior` which contains a summary of
@@ -162,7 +160,6 @@ estimate_secondary <- function(data,
                                model = NULL,
                                weigh_delay_priors = FALSE,
                                verbose = interactive(),
-                               ...,
                                reports) {
   # Deprecate reported_cases in favour of data
   if (!missing(reports)) {
diff --git a/man/estimate_secondary.Rd b/man/estimate_secondary.Rd
index fe526b41d..9d57f26e3 100644
--- a/man/estimate_secondary.Rd
+++ b/man/estimate_secondary.Rd
@@ -20,7 +20,6 @@ estimate_secondary(
   model = NULL,
   weigh_delay_priors = FALSE,
   verbose = interactive(),
-  ...,
   reports
 )
 }
@@ -91,8 +90,6 @@ parameters.}
 \item{verbose}{Logical, should model fitting progress be returned. Defaults
 to \code{\link[=interactive]{interactive()}}.}
 
-\item{...}{Additional parameters to pass to \code{\link[=stan_opts]{stan_opts()}}.}
-
 \item{reports}{Deprecated; use \code{data} instead.}
 }
 \value{