diff --git a/pyirf/sensitivity.py b/pyirf/sensitivity.py
index bdd181d8d..d90b5360e 100644
--- a/pyirf/sensitivity.py
+++ b/pyirf/sensitivity.py
@@ -13,7 +13,11 @@
 from .binning import create_histogram_table, bin_center
 
 
-__all__ = ["relative_sensitivity", "calculate_sensitivity"]
+__all__ = [
+    "relative_sensitivity",
+    "calculate_sensitivity",
+    "estimate_background",
+]
 
 
 log = logging.getLogger(__name__)