diff --git a/README.md b/README.md
index e8670c03..fb7a8084 100644
--- a/README.md
+++ b/README.md
@@ -251,7 +251,7 @@ carbon.Parse("2020-08-05 13:14:15").StartOfQuarter().ToDateTimeString() // 2020-
 carbon.Parse("2020-08-05 13:14:15").EndOfQuarter().ToDateTimeString() // 2020-09-30 23:59:59
 
 // Start of the month
-carbon.Parse("2020-08-05 13:14:15").StartOfMonth().ToStartTimeString() // 2020-08-01 00:00:00
+carbon.Parse("2020-08-05 13:14:15").StartOfMonth().ToDateTimeString() // 2020-08-01 00:00:00
 // End of the month
 carbon.Parse("2020-08-05 13:14:15").EndOfMonth().ToDateTimeString() // 2020-08-31 23:59:59