diff --git a/lineage_notes.txt b/lineage_notes.txt
index 58b9d03e..b31d2b93 100644
--- a/lineage_notes.txt
+++ b/lineage_notes.txt
@@ -1162,6 +1162,7 @@ BF.39.1	Alias of B.1.1.529.5.2.1.39.1, Chile/Peru, S:V445A, S:N450D
 BF.40	Alias of B.1.1.529.5.2.1.40, S:V445A, on C5284T branch
 BF.41	Alias of B.1.1.529.5.2.1.41, Brazil, ORF7b:A43V
 BF.41.1	Alias of B.1.1.529.5.2.1.41.1, Brazil, S:R346T
+BF.42	Alias of B.1.1.529.5.2.1.42, found in Japan, from pango-designation issue #1855
 BA.5.2.2	Alias of B.1.1.529.5.2.2, France and Martinique lineage
 BA.5.2.3	Alias of B.1.1.529.5.2.3, UK lineage
 BZ.1	Alias of B.1.1.529.5.2.3.1, Denmark lineage, defined by S:Q677H
diff --git a/lineages.csv b/lineages.csv
index b9b6f270..5d19550c 100644
--- a/lineages.csv
+++ b/lineages.csv
@@ -2364958,3 +2364958,33 @@ Singapore/R19MR104/2023,FP.1
 Singapore/R19MR234/2023,FP.1
 Singapore/R20MR276/2023,FP.1
 Singapore/R19MR22/2023,FP.1
+Japan/PG-462860/2023,BF.42
+Japan/PG-463710/2023,BF.42
+Japan/PG-462864/2023,BF.42
+Japan/PG-462863/2023,BF.42
+Japan/PG-458955/2023,BF.42
+Japan/TKYmbc34781/2023,BF.42
+Japan/PG-462868/2023,BF.42
+Japan/PG-462827/2023,BF.42
+Japan/PG-462916/2023,BF.42
+Japan/PG-461839/2023,BF.42
+Japan/PG-462912/2023,BF.42
+Japan/PG-462850/2023,BF.42
+Japan/PG-458938/2023,BF.42
+Japan/PG-462866/2023,BF.42
+Japan/PG-462813/2023,BF.42
+Japan/PG-458948/2023,BF.42
+Japan/PG-462867/2023,BF.42
+Japan/PG-462859/2023,BF.42
+Japan/PG-462779/2023,BF.42
+Japan/PG-458954/2023,BF.42
+Japan/PG-462862/2023,BF.42
+Japan/PG-462826/2023,BF.42
+Japan/PG-458940/2023,BF.42
+Japan/PG-458957/2023,BF.42
+Japan/PG-458953/2023,BF.42
+Japan/PG-462865/2023,BF.42
+Japan/PG-458956/2023,BF.42
+Japan/PG-462812/2023,BF.42
+Japan/PG-462783/2023,BF.42
+Japan/PG-462968/2023,BF.42