1 files changed, 2 insertions, 2 deletions
diff --git a/sheet.go b/sheet.go
index dedd2d9..a44e391 100644
--- a/sheet.go
+++ b/sheet.go
@@ -360,8 +360,8 @@ func (f *File) getSheetID(name string) int {
 }
 
 // GetSheetIndex provides a function to get a sheet index of the workbook by
-// the given sheet name. If the given sheet name is invalid, it will return an
-// integer type value 0.
+// the given sheet name. If the given sheet name is invalid or sheet doesn't
+// exist, it will return an integer type value -1.
 func (f *File) GetSheetIndex(name string) int {
 	var idx = -1
 	for index, sheet := range f.GetSheetList() {