diff --git a/.gitignore b/.gitignore
index 376844c..6d3c1d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,12 +7,13 @@ __pycache__/
 # pytest
 .pytest_cache/
 
-# epanet
-*.rpt
-*.opt
-
-# dev_demo
+# dev
 dev_demo.py
 
 # db inp
 *.db.inp
+
+# calculation
+*.rpt
+*.opt
+*.out.json