diff --git a/README.md b/README.md
index 5e0c03b..114e1c4 100644
--- a/README.md
+++ b/README.md
@@ -37,9 +37,9 @@ Check [GitHub Actions](https://github.com/mu-ruU1/vyos-build-container-image/act
 
 ### Make topology file
 
-sample-topology.yaml
+[sample-topology.yaml](./clab/sample.clab.yml)
 
-```yaml=sample-topology.yaml
+```yaml=sample.clab.yml
 name: sample-lab
 
 topology:
diff --git a/docker/Dockerfile b/docker/Dockerfile
index f05e0cb..438590d 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,9 +1,10 @@
 FROM ubuntu:latest
 
 RUN apt-get update && apt-get install -y \
-  iputils-ping \
+  iputils \
   traceroute \
   net-tools \
+  arp-scan \
   dnsutils \
   curl \
   wget \