diff --git a/.github/workflows/build-engine-package.yml b/.github/workflows/build-engine-package.yml
index 99ce159f4..21a30afef 100644
--- a/.github/workflows/build-engine-package.yml
+++ b/.github/workflows/build-engine-package.yml
@@ -650,7 +650,7 @@ jobs:
       - name: <Setup> Check out the repository
         uses: actions/checkout@v4
 
-      - name: <Deploy> Change tag to this commit for refreshing the release # c.f. voicevox_engine#854
+      - name: <Deploy> Change tag to this commit for refreshing the release # ref: https://github.com/VOICEVOX/voicevox_engine/issues/854
         run: |
           git tag -f ${{ needs.config.outputs.version }}
           git push -f --tag
diff --git a/pyproject.toml b/pyproject.toml
index e005bd894..98b3e9964 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,13 +29,13 @@ default-groups = []
 pyopenjtalk = { git = "https://github.com/VOICEVOX/pyopenjtalk", rev = "74703b034dd90a1f199f49bb70bf3b66b1728a86" }
 
 [dependency-groups]
-build = ["pyinstaller<6"] # NOTE: PyInstaller6ではmacOSのエディタにバンドルすると動作しなくなる (c.f. #1022)
+build = ["pyinstaller<6"] # NOTE: PyInstaller6ではmacOSのエディタにバンドルすると動作しなくなる (ref: https://github.com/VOICEVOX/voicevox_engine/issues/1022)
 dev = [
   "coveralls>=4.0.1",
   "httpx>=0.28.1", # NOTE: required by fastapi.testclient.TestClient (fastapi-slim's unmanaged dependency)
   "mypy>=1.10.0",
   "pip-audit>=2.7.3",
-  "pip-licenses==5.0.0", # NOTE: must be specified exactly (c.f. #1281)
+  "pip-licenses==5.0.0", # NOTE: must be specified exactly (ref: https://github.com/VOICEVOX/voicevox_engine/issues/1281)
   "pre-commit>=4.0.1",
   "pytest>=8.2.0",
   "ruff>=0.11.1",
diff --git a/voicevox_engine/core/core_wrapper.py b/voicevox_engine/core/core_wrapper.py
index f593b1492..6b980ec9c 100644
--- a/voicevox_engine/core/core_wrapper.py
+++ b/voicevox_engine/core/core_wrapper.py
@@ -252,7 +252,7 @@ def _find_version_0_12_core_or_later(core_dir: Path) -> str | None:
     - コアライブラリの名前が CORENAME_DICT の定義に従っている
 
     の両方が真のときである。
-    cf. https://github.com/VOICEVOX/voicevox_engine/issues/385
+    ref: https://github.com/VOICEVOX/voicevox_engine/issues/385
     """
     if (core_dir / "metas.json").exists():
         return None