diff --git a/annuity/__init__.py b/annuity/__init__.py
index 05bb45b..44956e9 100644
--- a/annuity/__init__.py
+++ b/annuity/__init__.py
@@ -1,4 +1,4 @@
-"""Initialize the package and define version."""
+"""Calculation of economic efficiency using the VDI 2067 annuity method."""
 from pkg_resources import get_distribution, DistributionNotFound
 
 try: