diff --git a/README.md b/README.md
index fbe720e..0008ca0 100644
--- a/README.md
+++ b/README.md
@@ -100,7 +100,7 @@ fumen_converted = convert_tja_to_fumen(tja)
 # modify the FumenCourse object
 # - e.g.1: change the timing window header metadata
 from tja2fumen.constants import TIMING_WINDOWS
-fumen.header.self.b000_b431_timing_windows = TIMING_WINDOWS['Easy']*36
+fumen.header.b000_b431_timing_windows = TIMING_WINDOWS['Easy']*36
 # - e.g.2: change the note offset values
 for measure in fumen.measures:
     measure.offset_start += 1_000  # 1000ms == 1s