diff --git a/src/QaqcMasterLog.jl b/src/QaqcMasterLog.jl
index 12429d4..2a68040 100644
--- a/src/QaqcMasterLog.jl
+++ b/src/QaqcMasterLog.jl
@@ -26,6 +26,14 @@ end
 
 Parse master log.
 If the `logfile` is empty, return `nothing`.
+
+# Examples
+
+```jldoctest
+julia> PSBoardDataBase.QaqcMasterLog.parse_master_log("../test/input/log/57_long.log")
+PSBoardDataBase.QaqcMasterLog.QaqcMasterLogMetadata(Dates.DateTime("2024-07-26T10:33:05"), 57, "Otsubo", v"1.0.2")
+
+```
 """
 function parse_master_log(logfile::AbstractString)
     open(logfile) do f