diff --git a/example.conf b/example.conf
index 34d6297..e999b3d 100644
--- a/example.conf
+++ b/example.conf
@@ -21,6 +21,14 @@
     profiles_max_keys    => 200   # similar profiles (JSON)
   },
 
+  # Crawlers that collect training data for language models are answered with
+  # 403 before anything is computed. The value is a regular expression that is
+  # matched against the User-Agent header; the built in list is in
+  # script/derekovecs-server. An empty string switches the blocking off.
+  # robots => {
+  #   block_user_agents => 'GPTBot|ClaudeBot|Meta-ExternalAgent|CCBot'
+  # },
+
   w2v => {
     vecs => "example-models/wpd19_10000/wpd19_10000.vecs",
     # compare_to => "https://corpora.ids-mannheim.de/openlab/derekovecs", # compare results to this derekovecs instance