diff --git a/R/extdata.R b/R/extdata.R
index f16e88b..1025c77 100644
--- a/R/extdata.R
+++ b/R/extdata.R
@@ -7,6 +7,8 @@
 #' Raw data can be viewed and contributed to at
 #' https://github.com/ITSLeeds/UK2GTFS-data
 #'
+#' @param timeout maximum duration (in seconds) to wait for a response from the server (github.com)
+#'
 #' @export
 #'
 update_data <- function( timeout=60 ){
diff --git a/man/update_data.Rd b/man/update_data.Rd
index 5e7e4c3..de69b19 100644
--- a/man/update_data.Rd
+++ b/man/update_data.Rd
@@ -4,7 +4,10 @@
 \alias{update_data}
 \title{Update the data inside the UK2GTFS package}
 \usage{
-update_data()
+update_data(timeout = 60)
+}
+\arguments{
+\item{timeout}{maximum duration (in seconds) to wait for a response from the server (github.com)}
 }
 \description{
 As UK2GTFS has large datasets that update separately to the R package they