diff --git a/README.md b/README.md
index c5ebbab..0756159 100644
--- a/README.md
+++ b/README.md
@@ -137,7 +137,7 @@ sudo clab destroy -t cvx-dcn.clab.yaml --cleanup
    docker run -it --rm --net container:clab-cdc-spine01 nicolaka/netshoot tshark -i swp1
    ```
 
-   To filter specific protocol, use the -Y option, for example '-Y "snmp"'. To filter based on port, use '-f "udp port 161'. Please consult the tshark documentaion for more details.
+   To filter specific protocol, use the -Y option, for example '-Y "snmp"'. To filter based on port, use '-f "udp port 161"'. Please consult the tshark documentaion for more details.
    
     
    You may also need to generate traffic in the network to observe the packets.