diff --git a/Tools/unicode/makeunicodedata.py b/Tools/unicode/makeunicodedata.py
index 0aebdca..18ed93a 100644
--- a/Tools/unicode/makeunicodedata.py
+++ b/Tools/unicode/makeunicodedata.py
@@ -41,6 +41,7 @@
 # When changing UCD version please update
 #   * Doc/library/stdtypes.rst, and
 #   * Doc/library/unicodedata.rst
+#   * Doc/reference/lexical_analysis.rst
 UNIDATA_VERSION = "6.3.0"
 UNICODE_DATA = "UnicodeData%s.txt"
 COMPOSITION_EXCLUSIONS = "CompositionExclusions%s.txt"