diff --git a/Makefile b/Makefile
index be17fbb..918d6a0 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ lint:
 	govulncheck ./...
 
 build:
-	go build -ldflags="$(BUILD_LDFLAGS)" -o gostyle cmd/gostyle/main.go
+	go build -ldflags="$(BUILD_LDFLAGS)" -o gostyle
 
 depsdev:
 	go install github.com/Songmu/ghch/cmd/ghch@latest
diff --git a/analyzer/effective/ifacenames/ifacenames.go b/analyzer/effective/ifacenames/ifacenames.go
index 9be2380..fab2f9b 100644
--- a/analyzer/effective/ifacenames/ifacenames.go
+++ b/analyzer/effective/ifacenames/ifacenames.go
@@ -10,12 +10,15 @@ import (
 	"golang.org/x/tools/go/ast/inspector"
 )
 
-const doc = "https://go.dev/doc/effective_go#interface-names"
+const doc = "Analyzer based on https://go.dev/doc/effective_go#interface-names."
 
-// Analyzer for https://go.dev/doc/effective_go#interface-names
+var all bool
+
+// Analyzer based on https://go.dev/doc/effective_go#interface-names.
 var Analyzer = &analysis.Analyzer{
 	Name: "ifacenames",
 	Doc:  doc,
+	URL:  "https://github.com/k1LoW/gostyle/tree/main/analyzer/effective/ifacenames",
 	Run:  run,
 	Requires: []*analysis.Analyzer{
 		inspect.Analyzer,
@@ -39,10 +42,15 @@ func run(pass *analysis.Pass) (any, error) {
 		case *ast.InterfaceType:
 			if len(n.Methods.List) == 1 {
 				mn := n.Methods.List[0].Names[0].Name
-				if !strings.HasPrefix(ii.Name, mn) || !strings.HasSuffix(ii.Name, "er") {
-					pass.Reportf(n.Pos(), "By convention, one-method interfaces are named by the method name plus an -er suffix or similar modification to construct an agent noun. (ref: https://go.dev/doc/effective_go#interface-names)")
+				if !strings.HasPrefix(ii.Name, mn) || !strings.HasSuffix(ii.Name, "er") { // huristic
+					pass.Reportf(n.Pos(), "by convention, one-method interfaces are named by the method name plus an -er suffix or similar modification to construct an agent noun. (ref: https://go.dev/doc/effective_go#interface-names)")
+					return
 				}
 			}
+			if all && !strings.HasSuffix(ii.Name, "er") {
+				pass.Reportf(n.Pos(), "all interface names with the -er suffix are required.")
+				return
+			}
 		case *ast.Ident:
 			ii = n
 		}
@@ -50,3 +58,7 @@ func run(pass *analysis.Pass) (any, error) {
 
 	return nil, nil
 }
+
+func init() {
+	Analyzer.Flags.BoolVar(&all, "all", false, "all interface names with the -er suffix are required")
+}
diff --git a/analyzer/effective/ifacenames/ifacenames_test.go b/analyzer/effective/ifacenames/ifacenames_test.go
index 911d4cb..2ffe4c0 100644
--- a/analyzer/effective/ifacenames/ifacenames_test.go
+++ b/analyzer/effective/ifacenames/ifacenames_test.go
@@ -9,6 +9,16 @@ import (
 
 // TestAnalyzer is a test for Analyzer.
 func TestAnalyzer(t *testing.T) {
-	testdata := testutil.WithModules(t, analysistest.TestData(), nil)
-	analysistest.Run(t, testdata, Analyzer, "a")
+	tests := []struct {
+		all bool // -all flag
+		pkg string
+	}{
+		{false, "a"},
+		{true, "b"},
+	}
+	for _, tt := range tests {
+		all = tt.all
+		testdata := testutil.WithModules(t, analysistest.TestData(), nil)
+		analysistest.Run(t, testdata, Analyzer, tt.pkg)
+	}
 }
diff --git a/analyzer/effective/ifacenames/testdata/src/a/a.go b/analyzer/effective/ifacenames/testdata/src/a/a.go
index 89b8d59..b51842a 100644
--- a/analyzer/effective/ifacenames/testdata/src/a/a.go
+++ b/analyzer/effective/ifacenames/testdata/src/a/a.go
@@ -1,13 +1,18 @@
 package a
 
-type Query interface { // want "By convention, one-method interfaces are named by the method name plus an -er suffix or similar modification to construct an agent noun."
+type Query interface { // want "-er suffix"
 	Do() error
 }
 
-type Closer interface { // want "By convention, one-method interfaces are named by the method name plus an -er suffix or similar modification to construct an agent noun."
+type Closer interface { // want "-er suffix"
 	Do() error
 }
 
 type Writer interface {
 	Write() error
 }
+
+type Add interface {
+	One() error
+	Two() error
+}
diff --git a/analyzer/effective/ifacenames/testdata/src/b/b.go b/analyzer/effective/ifacenames/testdata/src/b/b.go
new file mode 100644
index 0000000..4e8ffc5
--- /dev/null
+++ b/analyzer/effective/ifacenames/testdata/src/b/b.go
@@ -0,0 +1,18 @@
+package b
+
+type Query interface { // want "-er suffix"
+	Do() error
+}
+
+type Closer interface { // want "-er suffix"
+	Do() error
+}
+
+type Writer interface {
+	Write() error
+}
+
+type Add interface { // want "-er suffix"
+	One() error
+	Two() error
+}
diff --git a/analyzer/effective/ifacenames/testdata/src/b/go.mod b/analyzer/effective/ifacenames/testdata/src/b/go.mod
new file mode 100644
index 0000000..bbfbe3a
--- /dev/null
+++ b/analyzer/effective/ifacenames/testdata/src/b/go.mod
@@ -0,0 +1,3 @@
+module b
+
+go 1.21