diff --git a/keywords.md b/keywords.md
index 931d44c70def5..7b36591f10873 100644
--- a/keywords.md
+++ b/keywords.md
@@ -67,6 +67,7 @@ The following list shows the keywords in TiDB. Reserved keywords are marked with
 - ADMIN
 - ADVISE
 - AFTER
+- AFFINITY
 - AGAINST
 - AGO
 - ALGORITHM
@@ -674,6 +675,7 @@ The following list shows the keywords in TiDB. Reserved keywords are marked with
 - STATS_BUCKETS
 - STATS_COL_CHOICE
 - STATS_COL_LIST
+- STATS_DELTA
 - STATS_EXTENDED
 - STATS_HEALTHY
 - STATS_HISTOGRAMS