diff --git a/ChangeLog b/ChangeLog
index 786cb2a..8dfcd1b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2024-02-28  Dirk Eddelbuettel  <edd@debian.org>
+
+	* inst/examples/tttf.r: Use env -S r -t for per-session temp dir,
+	support command-line argument -c | --ci to set env.var CI
+
 2024-02-25  Dirk Eddelbuettel  <edd@debian.org>
 
 	* DESCRIPTION (Suggests): Removed package used in only one example
diff --git a/inst/examples/tttf.r b/inst/examples/tttf.r
index 48b52fd..1754bf3 100755
--- a/inst/examples/tttf.r
+++ b/inst/examples/tttf.r
@@ -1,8 +1,8 @@
-#!/usr/bin/env r
+#!/usr/bin/env -S r -t
 #
 # testthat::test_file wrapper
 #
-# Copyright (C) 2019 - 2023  Dirk Eddelbuettel
+# Copyright (C) 2019 - 2024  Dirk Eddelbuettel
 #
 # Released under GPL (>= 2)
 
@@ -15,10 +15,11 @@ suppressMessages({
 })
 
 ## configuration for docopt
-doc <- "Usage: tttf.r [-l LIB] [-s FILE] [-h] [-x] ARG
+doc <- "Usage: tttf.r [-l LIB] [-s FILE] [-c] [-h] [-x] ARG
 
 -l --library LIB    load named library, LIB can be comma-separated
 -s --source FILE    source a named file
+-c --ci             set environment variable CI to TRUE [default: FALSE]
 -h --help           show this help text
 -x --usage          show help and short example usage"
 opt <- docopt(doc)			# docopt parsing
@@ -49,4 +50,8 @@ if (!is.null(opt$source) && file.exists(opt$source)) {
     source(opt$source)
 }
 
+if (opt$ci) {
+    Sys.setenv(CI="TRUE")
+}
+
 testthat::test_file(path=opt$ARG)