diff --git a/id3v10.go b/id3v10.go
index 483b4f7..a007109 100644
--- a/id3v10.go
+++ b/id3v10.go
@@ -102,31 +102,31 @@ func WriteID3v1Tags(dst io.WriteSeeker, tags ID3v1Tags) error {
 	}
 
 	// Song name
-	err = writeToExtend(dst, []byte(tags.SongName), 30)
+	err = writeToExtent(dst, []byte(tags.SongName), 30)
 	if err != nil {
 		return err
 	}
 
 	// Artist
-	err = writeToExtend(dst, []byte(tags.Artist), 30)
+	err = writeToExtent(dst, []byte(tags.Artist), 30)
 	if err != nil {
 		return err
 	}
 
 	// Album
-	err = writeToExtend(dst, []byte(tags.Album), 30)
+	err = writeToExtent(dst, []byte(tags.Album), 30)
 	if err != nil {
 		return err
 	}
 
 	// Year
-	err = writeToExtend(dst, []byte(fmt.Sprint(tags.Year)), 4)
+	err = writeToExtent(dst, []byte(fmt.Sprint(tags.Year)), 4)
 	if err != nil {
 		return err
 	}
 
 	// Comment
-	err = writeToExtend(dst, []byte(tags.Comment), 30)
+	err = writeToExtent(dst, []byte(tags.Comment), 30)
 	if err != nil {
 		return err
 	}
diff --git a/id3v11.go b/id3v11.go
index 901445e..bc59d3c 100644
--- a/id3v11.go
+++ b/id3v11.go
@@ -116,31 +116,31 @@ func WriteID3v11Tags(dst io.WriteSeeker, tags ID3v11Tags) error {
 	}
 
 	// Song name
-	err = writeToExtend(dst, []byte(tags.SongName), 30)
+	err = writeToExtent(dst, []byte(tags.SongName), 30)
 	if err != nil {
 		return fmt.Errorf("could not write to dst: %s", err)
 	}
 
 	// Artist
-	err = writeToExtend(dst, []byte(tags.Artist), 30)
+	err = writeToExtent(dst, []byte(tags.Artist), 30)
 	if err != nil {
 		return fmt.Errorf("could not write to dst: %s", err)
 	}
 
 	// Album
-	err = writeToExtend(dst, []byte(tags.Album), 30)
+	err = writeToExtent(dst, []byte(tags.Album), 30)
 	if err != nil {
 		return fmt.Errorf("could not write to dst: %s", err)
 	}
 
 	// Year
-	err = writeToExtend(dst, []byte(fmt.Sprint(tags.Year)), 4)
+	err = writeToExtent(dst, []byte(fmt.Sprint(tags.Year)), 4)
 	if err != nil {
 		return fmt.Errorf("could not write to dst: %s", err)
 	}
 
 	// Comment
-	err = writeToExtend(dst, []byte(tags.Comment), 28)
+	err = writeToExtent(dst, []byte(tags.Comment), 28)
 	if err != nil {
 		return fmt.Errorf("could not write to dst: %s", err)
 	}
@@ -168,7 +168,7 @@ func WriteID3v11Tags(dst io.WriteSeeker, tags ID3v11Tags) error {
 	genrebyte := make([]byte, 1)
 	binary.PutVarint(genrebyte, int64(genreCode))
 
-	err = writeToExtend(dst, genrebyte, 1)
+	err = writeToExtent(dst, genrebyte, 1)
 	if err != nil {
 		return fmt.Errorf("could not write to dst: %s", err)
 	}
diff --git a/util.go b/util.go
index 0743b59..5117bcb 100644
--- a/util.go
+++ b/util.go
@@ -38,7 +38,7 @@ func readToString(rs io.Reader, n int) (string, error) {
 }
 
 // Writes data to wr, if len(data) is less than lenNeeded - adds null bytes until written lenNeeded bytes
-func writeToExtend(wr io.Writer, data []byte, lenNeeded int) error {
+func writeToExtent(wr io.Writer, data []byte, lenNeeded int) error {
 	if len(data) > lenNeeded {
 		return fmt.Errorf("length of given data bytes is bigger than length needed")
 	}