diff --git a/.gitignore b/.gitignore
index 54855d3..3cd126a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,10 @@
 *.out
 coverage.out
 .DS_Store
+
+# Build artefacts. Four .pyc files were tracked before this — three of them
+# committed by me in #62 via `git add -A` in a worktree, which is exactly the
+# accident an ignore rule exists to make impossible.
+__pycache__/
+*.py[cod]
+*$py.class
diff --git a/src/prophet_cli/__pycache__/__init__.cpython-312.pyc b/src/prophet_cli/__pycache__/__init__.cpython-312.pyc
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diff --git a/src/prophet_cli/__pycache__/cli.cpython-312.pyc b/src/prophet_cli/__pycache__/cli.cpython-312.pyc
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diff --git a/src/prophet_cli/__pycache__/config.cpython-312.pyc b/src/prophet_cli/__pycache__/config.cpython-312.pyc
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diff --git a/tests/__pycache__/test_config.cpython-312-pytest-8.3.5.pyc b/tests/__pycache__/test_config.cpython-312-pytest-8.3.5.pyc
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