diff --git a/.typos.toml b/.typos.toml
index 8e46a00d..b018163f 100644
--- a/.typos.toml
+++ b/.typos.toml
@@ -36,6 +36,7 @@ extend-ignore-re = [
 "EXPLAINed" = "EXPLAINed"
 "FH_ND_FILE" = "FH_ND_FILE"
 "INSERTs" = "INSERTs"
+"IST" = "IST"
 "JOINed" = "JOINed"
 "MERCHANTIBILITY" = "MERCHANTIBILITY"
 "ND" = "ND"