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-rw-r--r--src/timezone/pgtz.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/timezone/pgtz.c b/src/timezone/pgtz.c
index c673f1aa10f..581e27bba31 100644
--- a/src/timezone/pgtz.c
+++ b/src/timezone/pgtz.c
@@ -296,6 +296,9 @@ pg_tzset(const char *name)
* The GMT offset is specified in seconds, positive values meaning west of
* Greenwich (ie, POSIX not ISO sign convention). However, we use ISO
* sign convention in the displayable abbreviation for the zone.
+ *
+ * Caution: this can fail (return NULL) if the specified offset is outside
+ * the range allowed by the zic library.
*/
pg_tz *
pg_tzset_offset(long gmtoffset)