diff --git a/README.md b/README.md
index ececfa8..a5bafb5 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ if a file:
 - [x] content matches regex
 - [ ] content matches template
 - [x] content contains a value
-- [ ] is gitignored
+- [x] is gitignored
 - [ ] is gitcrypted
 - [ ] has specific permissions
 
diff --git a/internal/arch/file/should/be_gitignored.go b/internal/arch/file/should/be_gitignored.go
new file mode 100644
index 0000000..abd452f
--- /dev/null
+++ b/internal/arch/file/should/be_gitignored.go
@@ -0,0 +1,52 @@
+package should
+
+import (
+	"fmt"
+	"goarkitect/internal/arch/rule"
+	"os/exec"
+	"path/filepath"
+)
+
+func BeGitignored(opts ...Option) *gitIgnoredExpression {
+	expr := &gitIgnoredExpression{}
+
+	for _, opt := range opts {
+		opt.apply(&expr.options)
+	}
+
+	return expr
+}
+
+type gitIgnoredExpression struct {
+	baseExpression
+}
+
+func (e gitIgnoredExpression) Evaluate(rb rule.Builder) []rule.Violation {
+	return e.evaluate(rb, e.doEvaluate, e.getViolation)
+}
+
+func (e gitIgnoredExpression) doEvaluate(rb rule.Builder, filePath string) bool {
+	cmd := exec.Command("git", "check-ignore", "-q", filePath)
+	if err := cmd.Run(); err != nil {
+		switch err.(type) {
+		case *exec.ExitError:
+			return err.(*exec.ExitError).ExitCode() != 0
+		default:
+			panic(err)
+		}
+	}
+
+	return false
+}
+
+func (e gitIgnoredExpression) getViolation(filePath string) rule.Violation {
+	format := "file '%s' is not gitignored"
+
+	if e.options.negated {
+		format = "file '%s' is gitignored"
+	}
+
+	return rule.NewViolation(
+		fmt.Sprintf(format, filepath.Base(filePath)),
+	)
+}
diff --git a/internal/arch/file/should/be_gitignored_test.go b/internal/arch/file/should/be_gitignored_test.go
new file mode 100644
index 0000000..0a302cf
--- /dev/null
+++ b/internal/arch/file/should/be_gitignored_test.go
@@ -0,0 +1,69 @@
+package should_test
+
+import (
+	"goarkitect/internal/arch/file"
+	"goarkitect/internal/arch/file/should"
+	"goarkitect/internal/arch/rule"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+)
+
+func Test_BeGitignored(t *testing.T) {
+	basePath, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	testCases := []struct {
+		desc        string
+		ruleBuilder *file.RuleBuilder
+		options     []should.Option
+		want        []rule.Violation
+	}{
+		{
+			desc:        "file 'ignored.txt' should be gitignored",
+			ruleBuilder: file.One(filepath.Join(basePath, "test/ignored.txt")),
+			want:        nil,
+		},
+		{
+			desc:        "file 'not_ignored.txt' should be gitignored",
+			ruleBuilder: file.One(filepath.Join(basePath, "test/not_ignored.txt")),
+			want: []rule.Violation{
+				rule.NewViolation("file 'not_ignored.txt' is not gitignored"),
+			},
+		},
+		{
+			desc:        "negated: file 'ignored.txt' should not be gitignored",
+			ruleBuilder: file.One(filepath.Join(basePath, "test/ignored.txt")),
+			options: []should.Option{
+				should.Negated{},
+			},
+			want: []rule.Violation{
+				rule.NewViolation("file 'ignored.txt' is gitignored"),
+			},
+		},
+		{
+			desc:        "negated: file 'not_ignored.txt' should not be gitignored",
+			ruleBuilder: file.One(filepath.Join(basePath, "test/not_ignored.txt")),
+			options: []should.Option{
+				should.Negated{},
+			},
+			want: nil,
+		},
+	}
+
+	for _, tC := range testCases {
+		t.Run(tC.desc, func(t *testing.T) {
+			hcm := should.BeGitignored(tC.options...)
+			got := hcm.Evaluate(tC.ruleBuilder)
+
+			if !cmp.Equal(got, tC.want, cmp.AllowUnexported(rule.Violation{}), cmpopts.EquateEmpty()) {
+				t.Errorf("want = %+v, got = %+v", tC.want, got)
+			}
+		})
+	}
+}
diff --git a/internal/arch/file/should/test/.gitignore b/internal/arch/file/should/test/.gitignore
new file mode 100644
index 0000000..f89d64d
--- /dev/null
+++ b/internal/arch/file/should/test/.gitignore
@@ -0,0 +1 @@
+ignored.txt