diff --git a/README.md b/README.md
index 58f8d4d..0ce8c06 100644
--- a/README.md
+++ b/README.md
@@ -36,9 +36,7 @@ docker volume ls --format="{{.Name}}" | xargs docker volume rm
 docker images --format="{{.Repository}};{{.Tag}};{{.ID}}" | grep "<none>;<none>" | cut -d";" -f 3 | xargs docker rmi
 # Get all used images tag in dir $PATH_ANALYSE
 find $PATH_ANALYSE -name "Dockerfile*" | while read file; do cat $file; echo ""; done | grep -e FROM | cut -d " " -f 2 | sed $'s/[^[:print:]\t]//g' | sort -u | xargs -n1 docker pull
-# Calculate total docker images for each metrics
-docker images --format {{.Size}} | grep MB | cut -d M -f 1 | paste -sd+ | bc
-docker images --format {{.Size}} | grep GB | cut -d G -f 1 | paste -sd+ | bc
+# Calculate total docker images size
 docker images --format {{.ID}} | xargs -n1 docker inspect | jq '.[0]["Size"]' | paste -sd + | bc | format_bytes_str
 ```