diff --git a/bitset.go b/bitset.go
index ddfb516..8d42535 100644
--- a/bitset.go
+++ b/bitset.go
@@ -740,7 +740,7 @@ func (b *BitSet) Intersection(compare *BitSet) (result *BitSet) {
 	return
 }
 
-// IntersectionCardinality computes the cardinality of the union
+// IntersectionCardinality computes the cardinality of the intersection
 func (b *BitSet) IntersectionCardinality(compare *BitSet) uint {
 	panicIfNull(b)
 	panicIfNull(compare)
diff --git a/bitset_test.go b/bitset_test.go
index 96afd73..34d628a 100644
--- a/bitset_test.go
+++ b/bitset_test.go
@@ -129,7 +129,7 @@ func TestBitSetIsClear(t *testing.T) {
 	}
 }
 
-func TestExendOnBoundary(t *testing.T) {
+func TestExtendOnBoundary(t *testing.T) {
 	v := New(32)
 	defer func() {
 		if r := recover(); r != nil {