diff --git a/formatter.go b/formatter.go
index 0b46833..5772086 100644
--- a/formatter.go
+++ b/formatter.go
@@ -116,9 +116,9 @@ func (f *Formatter) VisitOption(o *Option) {
 	if o.AggregatedConstants != nil {
 		fmt.Fprintf(f.w, "{\n")
 		f.indentLevel++
-		for k, v := range o.AggregatedConstants {
+		for _, each := range o.AggregatedConstants {
 			f.indent(0)
-			fmt.Fprintf(f.w, "%s: %s\n", k, v.String())
+			fmt.Fprintf(f.w, "%s: %s\n", each.Name, each.Literal.String())
 		}
 		f.indent(-1)
 		fmt.Fprintf(f.w, "}")
diff --git a/option.go b/option.go
index 4999047..4df23dd 100644
--- a/option.go
+++ b/option.go
@@ -24,6 +24,7 @@
 package proto
 
 import "fmt"
+import "bytes"
 
 // Option is a protoc compiler option
 type Option struct {
@@ -31,7 +32,7 @@ type Option struct {
 	Constant            Literal
 	IsEmbedded          bool
 	Comment             *Comment
-	AggregatedConstants map[string]*Literal
+	AggregatedConstants []*NamedLiteral
 }
 
 // inlineComment is part of commentInliner.
@@ -130,25 +131,46 @@ func (o *Option) parse(p *Parser) error {
 type Literal struct {
 	Source   string
 	IsString bool
+	Comment  string
 }
 
 // String returns the source (if quoted then use double quote).
 func (l Literal) String() string {
+	var buf bytes.Buffer
 	if l.IsString {
-		return "\"" + l.Source + "\""
+		buf.WriteRune('"')
 	}
-	return l.Source
+	buf.WriteString(l.Source)
+	if l.IsString {
+		buf.WriteRune('"')
+	}
+	if len(l.Comment) > 0 {
+		buf.WriteString(" //")
+		buf.WriteString(l.Comment)
+	}
+	return buf.String()
 }
 
 // parse expects to read a literal constant after =.
 func (l *Literal) parse(p *Parser) error {
 	l.Source, l.IsString = p.s.scanLiteral()
+	p.s.skipWhitespace()
+	if p.s.peek('/') {
+		p.s.read() // consume first slash
+		l.Comment = p.s.scanComment()
+	}
 	return nil
 }
 
+// NamedLiteral associates a name with a Literal
+type NamedLiteral struct {
+	*Literal
+	Name string
+}
+
 // parseAggregate reads options written using aggregate syntax
 func (o *Option) parseAggregate(p *Parser) error {
-	o.AggregatedConstants = map[string]*Literal{}
+	o.AggregatedConstants = []*NamedLiteral{}
 	for {
 		tok, lit := p.scanIgnoreWhitespace()
 		if tRIGHTCURLY == tok {
@@ -166,7 +188,7 @@ func (o *Option) parseAggregate(p *Parser) error {
 		if err := l.parse(p); err != nil {
 			return err
 		}
-		o.AggregatedConstants[key] = l
+		o.AggregatedConstants = append(o.AggregatedConstants, &NamedLiteral{Name: key, Literal: l})
 	}
 	tok, lit := p.scanIgnoreWhitespace()
 	if tSEMICOLON != tok {
diff --git a/service_test.go b/service_test.go
index 6dd4b27..e18bf14 100644
--- a/service_test.go
+++ b/service_test.go
@@ -53,8 +53,8 @@ func TestRPCWithOptionAggregateSyntax(t *testing.T) {
 	proto := `service AccountService {
 		rpc CreateAccount (CreateAccount) returns (ServiceFault){
 			option (test_ident) = {
-				test: "test"
-				test2:"test2"
+				test: "test" // test
+				test2:"test2" // test2
 			};			
 		}
 	}`
@@ -77,10 +77,16 @@ func TestRPCWithOptionAggregateSyntax(t *testing.T) {
 	if got, want := len(opt.AggregatedConstants), 2; got != want {
 		t.Fatalf("got [%v] want [%v]", got, want)
 	}
-	if got, want := opt.AggregatedConstants["test"].Source, "test"; got != want {
+	if got, want := opt.AggregatedConstants[0].Source, "test"; got != want {
 		t.Errorf("got [%v] want [%v]", got, want)
 	}
-	if got, want := opt.AggregatedConstants["test2"].Source, "test2"; got != want {
+	if got, want := opt.AggregatedConstants[0].Comment, " test"; got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := opt.AggregatedConstants[1].Source, "test2"; got != want {
+		t.Errorf("got [%v] want [%v]", got, want)
+	}
+	if got, want := opt.AggregatedConstants[1].Comment, " test2"; got != want {
 		t.Errorf("got [%v] want [%v]", got, want)
 	}
 }