diff --git a/.gitignore b/.gitignore
index 9d5c9fe..336fded 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,9 @@
 syntax: glob
 
+# c/c++ artifacts
+*.o
+*.so
+
 # Build config
 local.conf
 
@@ -8,15 +12,13 @@ local.conf
 /dist/
 __pycache__/
 *.py[co]
-/.tox
 .pytest_cache
-/venv/
-/_venv/
+venv/
 *.egg-info/
-/*.egg-link
-/*.egg
-/.eggs/
-/pip-wheel-metadata/
+*.egg-link
+*.egg
+.eggs/
+pip-wheel-metadata/
 
 # file generated by setuptools_scm
 /src/pEp/__version__.py
@@ -46,5 +48,14 @@ __pycache__/
 # platform artifacts
 .DS_store
 
-
-/gen/data/
+# gen-cid
+/gen/data/output
+/gen/data/input/synth_shed/synth_shed
+/gen/data/input/test_data/test_lib
+/gen/examples/ext/synth_shed/gen/py_module.cc
+/gen/examples/ext/synth_shed/gen/py_module.yml2
+/src/pEp/_pEp/adapter_main.hh.ast.json
+/src/pEp/_pEp/adapter_main.hh.cid.json
+/src/pEp/_pEp/adapter_main.hh.header.json
+/gen/examples/lib/synth_shed/libsynth_shed.a
+/gen/examples/lib/synth_shed/synth_shed