diff --git a/etc/README.md b/etc/README.md
index 7b36fe6..c82f1a3 100644
--- a/etc/README.md
+++ b/etc/README.md
@@ -18,7 +18,7 @@ The certificate trust stores were retrieved from
 
 Google Chromium uses basically the trust stores above, see https://www.chromium.org/Home/chromium-security/root-ca-policy.
 
-If you want to test against e.g. a company internal CA you want to avoid warnings from the certificate stores here it's recommended to use ``ADDITIONAL_CA_FILES=<companyCA.pem ./testssl.sh <your cmdline>``. (The former mechanism was to put the company root CA certificate here.)
+If you want to check trust against e.g. a company internal CA you need to use ``./testssl.sh --add-ca companyCA1.pem,companyCA2.pem <further_cmds>`` or ``ADDITIONAL_CA_FILES=companyCA1.pem,companyCA2.pem ./testssl.sh <further_cmds>``.
 
 
 #### Further files