diff --git a/runefunc.go b/runefunc.go
index cacf4de..a3afba0 100644
--- a/runefunc.go
+++ b/runefunc.go
@@ -12,8 +12,12 @@ func IsSpace(rn rune) bool {
 	return rn == ' '
 }
 
+func IsTab(rn rune) bool {
+	return rn == '\t'
+}
+
 func IsWhitespace(rn rune) bool {
-	return IsSpace(rn) || IsNewLine(rn)
+	return IsSpace(rn) || IsTab(rn) || IsNewLine(rn)
 }
 
 func And(f ...RuneFunc) RuneFunc {