diff --git a/README.md b/README.md
index c9998cc..eb82493 100644
--- a/README.md
+++ b/README.md
@@ -135,6 +135,7 @@ in the environment. The supported options are:
 | WAITRESS_NO_EXPOSE_TRACEBACKS    | --no-expose-tracebacks           |
 | WAITRESS_NO_IPV6                 | --no-ipv6                        |
 | WAITRESS_NO_IPV4                 | --no-ipv4                        |
+| WAITRESS_CALL                    | --call                           |
 | WAITRESS_THREADS                 | --threads=`$VAL`                 |
 | WAITRESS_IDENT                   | --ident=`$VAL`                   |
 | WAITRESS_OUTBUF_OVERFLOW         | --outbuf_high_watermark=`$VAL`   |
diff --git a/scripts/run.sh b/scripts/run.sh
index 37b8fd0..b22d5eb 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -45,6 +45,9 @@ if [[ -z $params ]]; then
     params="--listen=*:80"
 fi
 
+if [[ -v $WAITRESS_CALL ]]; then
+  params=" $params --call"
+fi
 if [[ -v $WAITRESS_NO_IPV6 ]]; then
   params=" $params --no-ipv6"
 fi
@@ -90,4 +93,4 @@ fi
 
 # Start Waitress
 echo "waitress-serve $params $APP_MODULE"
-exec waitress-serve $params $APP_MODULE
\ No newline at end of file
+exec waitress-serve $params $APP_MODULE