expand docs

.env.docker

@@ -102,7 +102,12 @@ ADMIN_DOMAIN="${APP_DOMAIN}"
 # Defaults to "1000".
 #
 # See: https://docs.pixelfed.org/technical-documentation/config/#pf_max_users
-PF_MAX_USERS="false"
+PF_MAX_USERS="1000"
+
+# Enforce the maximum number of user accounts
+#
+# Defaults to "true".
+#PF_ENFORCE_MAX_USERS="true"
 
 # See: https://docs.pixelfed.org/technical-documentation/config/#oauth_enabled
 OAUTH_ENABLED="true"