diff --git a/.gitignore b/.gitignore
index 389de8a..d24d9e8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,8 +15,19 @@ __pycache__/
 *.sqlite-shm
 *.sqlite-wal
 
+# Office documents kept alongside the repo but not part of it.
+# "~$" files are Excel's lock files, recreated every time a workbook is opened.
+*.xlsx
+*.xls
+~$*
+
 # Local data
 data/
 
+# Virtualenvs. venv writes its own .gitignore since 3.11, but only for the
+# directory it creates — declare it here so other layouts are covered too.
+.venv/
+venv/
+
 # Local tooling
 .gstack/