added a doc string thing

1 files changed, 2 insertions, 0 deletions

diff --git a/reader/reader.go b/reader/reader.go
index 54ec2cc..751832b 100644
--- a/reader/reader.go
+++ b/reader/reader.go
@@ -39,6 +39,8 @@ func Keylens(dml DatamapLine) (int, int) {
 	return len(dml.Key), len(dml.Sheet)
 }
 
+// sheetInSlice is a helper which returns true
+// if a string is in a slice of strings
 func sheetInSlice(list []string, key string) bool {
 	for _, x := range list {
 		if x == key {