diff --git a/integration_test/testdoc.adoc b/integration_test/testdoc.adoc
index 005db786..a859fbc9 100644
--- a/integration_test/testdoc.adoc
+++ b/integration_test/testdoc.adoc
@@ -14,8 +14,8 @@ as they depend on other technology which are a bit to expensive to automate (cam
 the flutter test framework.
 
 To run the tests you need to specify the serial number of a Yubikey which the tests are able to run
-on (OBS this key will be reset by running the tests, so don't use one of your personal keys). This
-either be defined as an environment variable on execution, or in a CSV-file with serial numbers:
+on. IMPORTANT: this key will be reset by running the tests, so don't use one of your personal keys. The serial numbers should
+either be defined as an environment variable on execution, or in a CSV-file with:
 
     $ /yubioath-flutter/integration_test/test_res/resources/approved_serial_numbers.csv