diff --git a/lexer.go b/lexer.go
index d94cca6..f300959 100644
--- a/lexer.go
+++ b/lexer.go
@@ -288,6 +288,8 @@ func lexStartExpansion(l *lexer) stateFn {
 		return lexBracketName
 	case isAlpha(c):
 		return lexSimpleName
+	case isNum(c):
+		return lexNumberName
 	}
 	return nil // FIXME
 }
@@ -310,6 +312,18 @@ func lexSimpleName(l *lexer) stateFn {
 	}
 }
 
+func lexNumberName(l *lexer) stateFn {
+	for {
+		if !isNum(l.next()) {
+			l.backup()
+			name := l.token()
+			l.emit(itemReadParam(name))
+			l.ignore()
+			return lexText
+		}
+	}
+}
+
 func lexBracketName(l *lexer) stateFn {
 	if l.next() == '#' {
 		l.ignore()
diff --git a/posix_test.go b/posix_test.go
index e99e994..eb774a7 100644
--- a/posix_test.go
+++ b/posix_test.go
@@ -36,11 +36,13 @@ var paramtests = []struct {
 	{"${null}", "", ""},
 	{"${unset}", "", ""},
 	{"${1}X${2}", "oneXtwo", ""},
+	{"${11}X${22}", "elevenXtwenty-two", ""},
 
 	// Names, no brackets
 	{"$set", "yes", ""},
 	{"$set$set2", "yesyes-two", ""},
-	// {"$1X$2", "oneXtwo", ""}, // TODO(#3) parse numeric simple names
+	{"$1X$2", "oneXtwo", ""},
+	{"$11X$22", "elevenXtwenty-two", ""},
 
 	// Default
 	{"${set:-word}", "yes", ""},
@@ -154,6 +156,8 @@ func TestExpand_simple(t *testing.T) {
 		"null": "",
 		"1":    "one",
 		"2":    "two",
+		"11":   "eleven",
+		"22":   "twenty-two",
 	}
 
 	for _, tt := range paramtests {
@@ -171,7 +175,7 @@ func TestExpand_simple(t *testing.T) {
 	}
 }
 
-func TestExand_assignReadOnlyFunc(t *testing.T) {
+func TestExpand_assignReadOnlyFunc(t *testing.T) {
 	_, err := Expand("${unset:=word}", Func(func(s string) string {
 		return ""
 	}))
@@ -180,7 +184,7 @@ func TestExand_assignReadOnlyFunc(t *testing.T) {
 	}
 }
 
-func TestExand_assignReadOnlyMap(t *testing.T) {
+func TestExpand_assignReadOnlyMap(t *testing.T) {
 	_, err := Expand("${unset:=word}", Map(nil))
 	if err == nil {
 		t.Fatal("assignment on read-only map should return an error")