diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index bf67007..6c9f06a 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -15,3 +15,4 @@
 ## Bug Fixes
 
 * Change 0.0 to nan if there is no data available
+* Enforce keyword arguments in cumulative_energy function
diff --git a/src/frequenz/reporting/_reporting.py b/src/frequenz/reporting/_reporting.py
index b960733..137c112 100644
--- a/src/frequenz/reporting/_reporting.py
+++ b/src/frequenz/reporting/_reporting.py
@@ -17,6 +17,7 @@
 
 # pylint: disable-next=too-many-arguments
 async def cumulative_energy(
+    *,
     client: ReportingApiClient,
     microgrid_id: int,
     component_id: int,