diff --git a/.goreleaser.yml b/.goreleaser.yml
index b9f562e..b13316e 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -31,3 +31,13 @@ checksum:
 
 changelog:
   use: git
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^chore:"
+      - "^ci:"
+      - "merge conflict"
+      - "^Merge pull request"
+      - "^Merge branch"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..90bb0fa
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+.PHONY: tag-next tag-patch tag-minor tag-major
+
+tag-next:
+	@if [ -z "$(TYPE)" ]; then \
+		echo "TYPE is required (patch|minor|major)"; \
+		echo "example: make tag-next TYPE=patch"; \
+		exit 2; \
+	fi
+	@./scripts/tag-next-version.sh "$(TYPE)"
+
+tag-patch:
+	@./scripts/tag-next-version.sh patch
+
+tag-minor:
+	@./scripts/tag-next-version.sh minor
+
+tag-major:
+	@./scripts/tag-next-version.sh major
diff --git a/README.md b/README.md
index c3cfc10..9922b92 100644
--- a/README.md
+++ b/README.md
@@ -95,9 +95,36 @@ jq -e '.estimatedBranchCoverage >= 70' gobce.json
 
 For stable CI behavior, prefer pinned versions (`@vX.Y.Z`) over `@latest`.
 
+## Versioning Policy
+
+`gobce` follows [Semantic Versioning](https://semver.org/).
+
+During the pre-1.0 phase, this project is versioned as `0.x` while coverage logic is validated in a real project.
+
+- `PATCH` (`0.1.0` -> `0.1.1`): bug fixes only
+- `MINOR` (`0.1.1` -> `0.2.0`): new features, behavior changes, and potentially breaking changes
+- `MAJOR` (`1.x`): used after the interface and output become stable
+
+Please assume that interfaces and output formats may change between `0.x` minor versions.
+
+Version tags use the `vX.Y.Z` format (for example, `v0.1.0`).
+
 ## Release Flow
 
 This repository is configured to publish GitHub Releases via GoReleaser when a version tag is pushed.
+Release notes are generated automatically from git commits between tags using GoReleaser changelog support.
+
+You can create the next SemVer tag with:
+
+```bash
+make tag-patch
+make tag-minor
+make tag-major
+# or
+make tag-next TYPE=patch
+make tag-next TYPE=minor
+make tag-next TYPE=major
+```
 
 ```bash
 git tag v0.1.0
@@ -107,8 +134,11 @@ git push origin v0.1.0
 After push:
 - GitHub Actions workflow `release` runs automatically
 - GitHub Release is created for `v0.1.0`
+- Release notes are generated from commit history
 - OS/arch archives and `checksums.txt` are uploaded
 
+To keep generated release notes clean, prefer commit prefixes such as `feat:`, `fix:`, `refactor:`, and `perf:`.
+
 ## Design
 
 Design notes are available in:
diff --git a/scripts/tag-next-version.sh b/scripts/tag-next-version.sh
new file mode 100755
index 0000000..bdfe966
--- /dev/null
+++ b/scripts/tag-next-version.sh
@@ -0,0 +1,67 @@
+#!/usr/bin/env sh
+
+set -eu
+
+usage() {
+  echo "usage: $0 <patch|minor|major>"
+  echo "example: $0 patch"
+}
+
+if [ "${1-}" = "" ]; then
+  usage
+  exit 2
+fi
+
+bump_type="$1"
+case "$bump_type" in
+  patch|minor|major) ;;
+  *)
+    echo "unsupported bump type: $bump_type" >&2
+    usage
+    exit 2
+    ;;
+esac
+
+if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+  echo "this command must run inside a git repository" >&2
+  exit 1
+fi
+
+latest_tag="$(git tag --list 'v[0-9]*.[0-9]*.[0-9]*' --sort=-version:refname | sed -n '1p')"
+
+if [ -z "$latest_tag" ]; then
+  major=0
+  minor=0
+  patch=0
+else
+  version="${latest_tag#v}"
+  major="$(echo "$version" | cut -d. -f1)"
+  minor="$(echo "$version" | cut -d. -f2)"
+  patch="$(echo "$version" | cut -d. -f3)"
+fi
+
+case "$bump_type" in
+  patch)
+    patch=$((patch + 1))
+    ;;
+  minor)
+    minor=$((minor + 1))
+    patch=0
+    ;;
+  major)
+    major=$((major + 1))
+    minor=0
+    patch=0
+    ;;
+esac
+
+next_tag="v${major}.${minor}.${patch}"
+
+if git rev-parse -q --verify "refs/tags/${next_tag}" >/dev/null 2>&1; then
+  echo "tag already exists: ${next_tag}" >&2
+  exit 1
+fi
+
+git tag "${next_tag}"
+echo "created tag: ${next_tag}"
+echo "push with: git push origin ${next_tag}"