diff --git a/plugins/lookup/tss.py b/plugins/lookup/tss.py
index 3b561e94fc..880e6e3833 100644
--- a/plugins/lookup/tss.py
+++ b/plugins/lookup/tss.py
@@ -14,6 +14,10 @@ description:
     - Uses the Thycotic Secret Server Python SDK to get Secrets from Secret
       Server using token authentication with I(username) and I(password) on
       the REST API at I(base_url).
+    - When using self-signed certificates the environment variable
+      C(REQUESTS_CA_BUNDLE) can be set to a file containing the trusted certificates
+      (in C(.pem) format).
+    - For example, C(export REQUESTS_CA_BUNDLE='/etc/ssl/certs/ca-bundle.trust.crt').
 requirements:
     - python-tss-sdk - https://pypi.org/project/python-tss-sdk/
 options: