diff --git a/doc/src/man/linkchecker.rst b/doc/src/man/linkchecker.rst
index b8a9b220..904f60bd 100644
--- a/doc/src/man/linkchecker.rst
+++ b/doc/src/man/linkchecker.rst
@@ -334,6 +334,8 @@ under Windows systems. On a Mac use
 the Internet Config to select a proxy.
 You can also set a comma-separated domain list in the :envvar:`no_proxy`
 environment variables to ignore any proxy settings for these domains.
+The :envvar:`curl_ca_bundle` environment variable can be used to identify an
+alternative certificate bundle to be used with an HTTPS proxy.
 
 Setting a HTTP proxy on Unix for example looks like this:
 
diff --git a/linkcheck/director/console.py b/linkcheck/director/console.py
index 318173ff..e2bc6e06 100644
--- a/linkcheck/director/console.py
+++ b/linkcheck/director/console.py
@@ -105,7 +105,7 @@ def print_env_info(key, out=stderr):
 
 def print_proxy_info(out=stderr):
     """Print proxy info."""
-    for key in ("http_proxy", "https_proxy", "no_proxy"):
+    for key in ("http_proxy", "https_proxy", "curl_ca_bundle", "no_proxy"):
         print_env_info(key, out=out)