diff --git a/.pre-commit-hooks.yaml b/.pre-commit-hooks.yaml
index 3399509..88e20c9 100644
--- a/.pre-commit-hooks.yaml
+++ b/.pre-commit-hooks.yaml
@@ -15,6 +15,6 @@
   name: generate-renovate-annotations
   description: Generate Renovate tags in environment.yml files
   entry: generate-renovate-annotations
-  files: environment.*\.ya?ml
+  files: environment[\w-]*\.ya?ml
   args: []
   language: python
diff --git a/tests/test_generate_renovate_annotations.py b/tests/test_generate_renovate_annotations.py
index 5dbc141..5c2a66d 100644
--- a/tests/test_generate_renovate_annotations.py
+++ b/tests/test_generate_renovate_annotations.py
@@ -1,4 +1,5 @@
 import json
+import re
 import subprocess
 from pathlib import Path
 from textwrap import dedent
@@ -14,6 +15,8 @@
     setup_conda_environment,
 )
 
+DEFAULT_FILES_REGEX_STRING = r"environment[\w-]*\.ya?ml"
+
 ENVIRONMENT_YAML = dedent("""\
     channels:
     - defaults
@@ -31,6 +34,40 @@
 """)
 
 
+@pytest.fixture()
+def repo_root() -> Path:
+    return Path(__file__).parents[1]
+
+
+def test_ensure_default_files_regex_in_pre_commit_hooks_yaml_matches_tested(repo_root):
+    """This test ensures that the regex tested below is the same as what is in .pre-commit-hooks.yaml."""
+    pre_commit_hooks_path = repo_root / ".pre-commit-hooks.yaml"
+    hooks = yaml.safe_load(pre_commit_hooks_path.read_text())
+
+    hook_map = {h["id"]: h for h in hooks}
+    hook_spec = hook_map["generate-renovate-annotations"]
+    files_regex = hook_spec["files"]
+
+    assert files_regex == DEFAULT_FILES_REGEX_STRING
+
+
+@pytest.mark.parametrize(
+    "string, expected_match",
+    [
+        ("requirements.txt", False),
+        ("environment.yml", True),
+        ("environment-dev.yml", True),
+        ("environment.yaml", True),
+        ("environment-dev.yaml", True),
+        ("path/to/environment.yml", True),
+        ("infra/environments/base.yml", False),
+    ],
+)
+def test_default_files_regex(string, expected_match):
+    match = re.search(DEFAULT_FILES_REGEX_STRING, string)
+    assert bool(match) is expected_match
+
+
 @pytest.fixture()
 def environment_yaml():
     return yaml.safe_load(ENVIRONMENT_YAML)