diff --git a/R/get_smips.R b/R/get_smips.R
index 714fc12..6896540 100644
--- a/R/get_smips.R
+++ b/R/get_smips.R
@@ -13,7 +13,14 @@
 #'  Defaults to \dQuote{totalbucket}.
 #' @param day A single day's date to query, _e.g._, `day = "2017-12-31"`, both
 #'  `Character` and `Date` classes are accepted.
-#'
+#' @param api_key A `character` string containing your \acronym{API} key,
+#'   a random string provided to you by \acronym{TERN}, for the request.
+#'   Defaults to automatically detecting your key from your local .Renviron,
+#'   .Rprofile or similar.  Alternatively, you may directly provide your key as
+#'   a string here or use functionality like that from \CRANpkg{keyring}.  If
+#'   nothing is provided, you will be prompted on how to set up your \R session
+#'   so that it is auto-detected and a browswer window will open at the
+#'   \acronym{TERN} website for you to request a key.
 #' @examples
 #' r <- get_smips(day = "2024-01-01")
 #'
@@ -26,19 +33,20 @@
 get_smips <- function(collection = "totalbucket",
                       day,
                       api_key = get_key()) {
-
   day <- lubridate::ymd(day)
   url_date <- gsub("-", "", day)
   url_year <- lubridate::year(day)
 
   .check_collection_agreement(.collection = collection, .day = day)
 
-  approved_collections <- c("totalbucket",
-                            "SMindex",
-                            "bucket1",
-                            "bucket2",
-                            "deepD",
-                            "runnoff")
+  approved_collections <- c(
+    "totalbucket",
+    "SMindex",
+    "bucket1",
+    "bucket2",
+    "deepD",
+    "runnoff"
+  )
   collection <- rlang::arg_match(collection, approved_collections)
 
   collection_url <- data.table::fcase(
@@ -56,14 +64,16 @@ get_smips <- function(collection = "totalbucket",
     paste0("smips_runoff_mm_", url_date, ".tif")
   )
 
-  r <- terra::rast(paste0("/vsicurl/https://",
-                    paste0('apikey:', api_key),
-                    "@data.tern.org.au/model-derived/smips/v1_0/",
-                   collection,
-                   "/",
-                   url_year,
-                   "/",
-                   collection_url))
+  r <- terra::rast(paste0(
+    "/vsicurl/https://",
+    paste0("apikey:", api_key),
+    "@data.tern.org.au/model-derived/smips/v1_0/",
+    collection,
+    "/",
+    url_year,
+    "/",
+    collection_url
+  ))
   return(r)
 }
 
@@ -73,8 +83,8 @@ get_smips <- function(collection = "totalbucket",
   .url_year <- lubridate::year(.day)
 
   if (.collection == "totalbucket" &&
-      .url_year < 2005 ||
-      .day > .last_week) {
+    .url_year < 2005 ||
+    .day > .last_week) {
     cli::cli_abort("The data are not available before 2005 and past {.last_week}")
   }
 }
diff --git a/man/get_smips.Rd b/man/get_smips.Rd
index 581abeb..da0301f 100644
--- a/man/get_smips.Rd
+++ b/man/get_smips.Rd
@@ -21,6 +21,15 @@ Defaults to \dQuote{totalbucket}.
 
 \item{day}{A single day's date to query, \emph{e.g.}, \code{day = "2017-12-31"}, both
 \code{Character} and \code{Date} classes are accepted.}
+
+\item{api_key}{A \code{character} string containing your \acronym{API} key,
+a random string provided to you by \acronym{TERN}, for the request.
+Defaults to automatically detecting your key from your local .Renviron,
+.Rprofile or similar.  Alternatively, you may directly provide your key as
+a string here or use functionality like that from \CRANpkg{keyring}.  If
+nothing is provided, you will be prompted on how to set up your \R session
+so that it is auto-detected and a browswer window will open at the
+\acronym{TERN} website for you to request a key.}
 }
 \value{
 A \link[terra:rast]{terra::rast} object