diff --git a/sm9/sm9.go b/sm9/sm9.go
index a2cd67f..c8b02c5 100644
--- a/sm9/sm9.go
+++ b/sm9/sm9.go
@@ -1,4 +1,4 @@
 // Package sm9 handle shangmi sm9 algorithm and its curves and pairing implementation
 package sm9
 
-// TODO: implement SM9 algorithm based on basic curves, G1/G2/GT and r-ate pairing implementation.
\ No newline at end of file
+// TODO: implement SM9 algorithm based on basic curves, G1/G2/GT and r-ate pairing implementation.