diff --git a/zk/AWS_CLI.md b/zk/AWS_CLI.md
index c54a154..66dc9b6 100644
--- a/zk/AWS_CLI.md
+++ b/zk/AWS_CLI.md
@@ -38,3 +38,12 @@ aws cloudformation delete-stack --stack-name <my_stack> --region <region>
 ```
 
 `region` is optional especially if only deployed to one region
+
+## Billing ("Cost explorer")
+
+### Usage for month
+
+```
+ aws ce get-cost-and-usage --time-period Start=$(date +%Y-%m-01),End=$(date -d @$(( $(date +%s) + 86400 )) +%Y-%m-%d) --granularity MONTHLY --metrics "UnblendedCost" "UsageQuantity
+
+```