diff --git a/rdl/parser.go b/rdl/parser.go
index 380bc2e..7214afe 100644
--- a/rdl/parser.go
+++ b/rdl/parser.go
@@ -224,7 +224,11 @@ func (p *parser) parseSchema() {
 					p.registerResource(r)
 				}
 			default:
-				p.error("Unrecognized keyword in schema: '" + txt + "'")
+				if strings.HasPrefix(txt, "x_") {
+					p.schema.Annotations = p.parseExtendedOption(p.schema.Annotations, ExtendedAnnotation(txt))
+				} else {
+					p.error("Unrecognized keyword in schema: '" + txt + "'")
+				}
 			}
 		case ';':
 			p.warning("stray ';' character")
diff --git a/rdl/parser_test.go b/rdl/parser_test.go
index 83e8458..696558a 100644
--- a/rdl/parser_test.go
+++ b/rdl/parser_test.go
@@ -479,3 +479,23 @@ type TestEnum Enum {
 		test.Errorf("Enum type parsed incorrectly: %v", s1)
 	}
 }
+
+func TestSchemaAnnotations(test *testing.T) {
+	var err error
+	s1, err := parseRDLString(`
+//this is a schema annotation test
+name foo;
+version 1
+x_something="23"
+x_blah = "blah"
+
+type Foo Struct {
+    String text
+}
+`)
+	if err != nil {
+		test.Errorf("cannot parse valid RDL: %v", err)
+		return
+	}
+	fmt.Println("schema:", s1)
+}
diff --git a/rdl/rdl_schema.go b/rdl/rdl_schema.go
index 06874ce..20b8c58 100644
--- a/rdl/rdl_schema.go
+++ b/rdl/rdl_schema.go
@@ -232,6 +232,7 @@ func init() {
 	tSchema.ArrayField("types", "Type", true, "The types this schema defines.")
 	tSchema.ArrayField("resources", "Resource", true, "The resources for a service this schema defines")
 	tSchema.Field("base", "String", true, nil, "the base path for resources in the schema.")
+	tSchema.MapField("annotations", "ExtendedAnnotation", "String", true, "additional annotations starting with \"x_\"")
 	sb.AddType(tSchema.Build())
 
 	schema = sb.Build()
diff --git a/rdl/schema.go b/rdl/schema.go
index 7111c8a..94114dc 100644
--- a/rdl/schema.go
+++ b/rdl/schema.go
@@ -2053,6 +2053,11 @@ type Schema struct {
 	// the base path for resources in the schema.
 	//
 	Base string `json:"base,omitempty" rdl:"optional"`
+
+	//
+	// additional annotations starting with "x_"
+	//
+	Annotations map[ExtendedAnnotation]string `json:"annotations,omitempty" rdl:"optional"`
 }
 
 //
diff --git a/testdata/rdl.rdl b/testdata/rdl.rdl
index 1a62e15..ba172e3 100644
--- a/testdata/rdl.rdl
+++ b/testdata/rdl.rdl
@@ -257,4 +257,5 @@ type Schema Struct {
     Array<Type> types (optional); // The types this schema defines.
     Array<Resource> resources (optional); // The resources for a service this schema defines
     String base (optional); //the base path for resources in the schema.
+    Map<ExtendedAnnotation,String> annotations (optional); //additional annotations starting with "x_"
 }