diff --git a/lexer/runes.go b/lexer/runes.go
new file mode 100644
index 0000000..9b13b5a
--- /dev/null
+++ b/lexer/runes.go
@@ -0,0 +1,9 @@
+package lexer
+
+import "unicode"
+
+// IsSpace reports whether the rune is a space character as
+// defined by Unicode's White Space property
+func IsSpace(r rune) bool {
+	return unicode.IsSpace(r)
+}