diff --git a/monitoring/db/README.md b/monitoring/db/README.md
index f22836a..3cdf281 100644
--- a/monitoring/db/README.md
+++ b/monitoring/db/README.md
@@ -23,3 +23,9 @@ Requirements:
  Created file detailed_power.2335001.hawk-pbs5.100000-1000004.csv
  Created file detailed_power.7678069.hawk-pbs5.2432345-423423.csv
  ```
+
+Querrying Hawk-AI nodes requires the option `--hawk-ai`.
+
+The time resolution can be set with the option `--interval`.
+
+Note, that small intervals will lead to data gaps. In particular, not all nodes will report power values for a given time stamp. Multiple values within an interval are averaged arithmetically. This migth make it difficult to use the output of this script to calculate total energy used by a job.