diff --git a/DESCRIPTION b/DESCRIPTION
index 2aa4b17..4e8aed8 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: shinyusertracking
 Title: Add user tracking to Shiny apps
-Version: 1.0.3.000
+Version: 1.0.4.000
 Authors@R: 
     person(
       "Mark", "McPherson", , 
@@ -11,9 +11,11 @@ Description: Log session and user data to a Google sheet.
 License: MIT + file LICENSE
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.3.1
+RoxygenNote: 7.3.3
 Config/testthat/edition: 3
 VignetteBuilder: knitr
+Depends:
+    R (>= 4.1.0)
 Imports: 
     googlesheets4,
     lubridate,
diff --git a/R/usertracking.R b/R/usertracking.R
index 19c7b6c..c96559f 100644
--- a/R/usertracking.R
+++ b/R/usertracking.R
@@ -96,7 +96,8 @@ check_cols <- function(columns) {
     "username",
     "login",
     "logout",
-    "duration"
+    "duration",
+    "tag"
   )
 
   if (is.null(columns)) {
@@ -127,7 +128,7 @@ check_cols <- function(columns) {
 #' setup_sheet("A new Shiny app", c("login", "logout", "duration"))
 #' }
 setup_sheet <- function(sheet_name = pkgload::pkg_name(),
-                        columns = c("login", "logout", "duration"),
+                        columns = c("login", "logout", "duration", "tag"),
                         creds = ".google-sheets-credentials") {
   columns <- check_cols(columns)
 
@@ -165,6 +166,7 @@ setup_sheet <- function(sheet_name = pkgload::pkg_name(),
 #'  duration. By default login, logout and duration will be logged.
 #' @param creds File used to store credentials. Defaults to `.google-sheets-credentials`.
 #' @param no_local Whether to ignore local sessions. Default is TRUE.
+#' @param tag A custom label for this app. If NULL, defaults to the app's URL.
 #'
 #' @return Nothing, used for side-effects only
 #'
@@ -185,9 +187,9 @@ setup_sheet <- function(sheet_name = pkgload::pkg_name(),
 #' shinyApp(ui, server)
 #' }
 use_logging <- function(sheet_name = pkgload::pkg_name(),
-                        columns = c("login", "logout", "duration"),
+                        columns = c("login", "logout", "duration", "tag"),
                         creds = ".google-sheets-credentials",
-                        no_local = TRUE) {
+                        no_local = TRUE, tag = NULL) {
   # If session appears to be local, do nothing
   is_server <- nzchar(Sys.getenv("SHINY_PORT"))
   if (no_local && !is_server) {
@@ -209,6 +211,13 @@ use_logging <- function(sheet_name = pkgload::pkg_name(),
 
   session <- get("session", parent.frame())
 
+  # Construct URL if tag is NULL
+  if (is.null(tag)) {
+    tag <- paste0(session$clientData$url_protocol, "//",
+                  session$clientData$url_hostname,
+                  session$clientData$url_pathname)
+  }
+
   set_credentials(creds)
 
   googlesheets4::gs4_auth(
@@ -221,7 +230,8 @@ use_logging <- function(sheet_name = pkgload::pkg_name(),
     username = ifelse(is.null(session$user), "unknown", session$user),
     login = Sys.time(),
     logout = lubridate::NA_POSIXct_,
-    duration = NA_character_
+    duration = NA_character_,
+    tag = tag
   )
 
   session$onSessionEnded(function() {
diff --git a/man/setup_sheet.Rd b/man/setup_sheet.Rd
index 2978534..4dd52e5 100644
--- a/man/setup_sheet.Rd
+++ b/man/setup_sheet.Rd
@@ -6,7 +6,7 @@
 \usage{
 setup_sheet(
   sheet_name = pkgload::pkg_name(),
-  columns = c("login", "logout", "duration"),
+  columns = c("login", "logout", "duration", "tag"),
   creds = ".google-sheets-credentials"
 )
 }
diff --git a/man/use_logging.Rd b/man/use_logging.Rd
index 14537ce..5c13a88 100644
--- a/man/use_logging.Rd
+++ b/man/use_logging.Rd
@@ -6,9 +6,10 @@
 \usage{
 use_logging(
   sheet_name = pkgload::pkg_name(),
-  columns = c("login", "logout", "duration"),
+  columns = c("login", "logout", "duration", "tag"),
   creds = ".google-sheets-credentials",
-  no_local = TRUE
+  no_local = TRUE,
+  tag = NULL
 )
 }
 \arguments{
@@ -20,6 +21,8 @@ duration. By default login, logout and duration will be logged.}
 \item{creds}{File used to store credentials. Defaults to \code{.google-sheets-credentials}.}
 
 \item{no_local}{Whether to ignore local sessions. Default is TRUE.}
+
+\item{tag}{A custom label for this app. If NULL, defaults to the app's URL.}
 }
 \value{
 Nothing, used for side-effects only
diff --git a/vignettes/adding-logging-to-a-shiny-app.Rmd b/vignettes/adding-logging-to-a-shiny-app.Rmd
index b813553..5d0f86e 100644
--- a/vignettes/adding-logging-to-a-shiny-app.Rmd
+++ b/vignettes/adding-logging-to-a-shiny-app.Rmd
@@ -44,7 +44,7 @@ The file in which credentials are saved will be added to the `.gitignore` file a
 
 ## Set up logging sheet
 
-Once the credentials are added you can add a new sheet for the app. To do this, again ensuring you are in the root directory of the R project containing the app, run `setup_sheet()`. This will append a new sheet to the sheet with ID provided earlier. By default, `login`, `logout` and `duration` will be logged. Although `sessionid` and `username` are also available, these have potential to be treated as PII.
+Once the credentials are added you can add a new sheet for the app. To do this, again ensuring you are in the root directory of the R project containing the app, run `setup_sheet()`. This will append a new sheet to the sheet with ID provided earlier. By default, `login`, `logout`, `duration` and `tag` will be logged. Although `sessionid` and `username` are also available, these have potential to be treated as PII.
 
 Before the sheet can be added, authorisation must take place. You have two options.
 
@@ -68,6 +68,12 @@ server <- function(input, output, session) {
 }
 ```
 
+By default, the `tag` used will be the deployed app's URL. You can set a custom `tag` like
+
+```r
+shinyusertracking::use_logging(tag = "Version for 2023/24")
+```
+
 ## Shiny apps as packages
 
 If your shiny app is a package, such as when using `golem`, you will need to add this package to your `DESCRIPTION` file in `Imports` and `Remotes`.