diff --git a/man5/tzfile.5 b/man5/tzfile.5
index 514f40798..7419a3dce 100644
--- a/man5/tzfile.5
+++ b/man5/tzfile.5
@@ -41,6 +41,7 @@ in order:
 .TP
 .I tzh_ttisgmtcnt
 The number of UT/local indicators stored in the file.
+(UT is Universal Time.)
 .TP
 .I tzh_ttisstdcnt
 The number of standard/wall indicators stored in the file.