diff --git a/src/xpdev/xpdatetime.c b/src/xpdev/xpdatetime.c
index 825ebca7fd936a224db042c6a94871e32ce5801e..83dc01b0bdb45979e8c83e4459f51d0e3a30fb60 100644
--- a/src/xpdev/xpdatetime.c
+++ b/src/xpdev/xpdatetime.c
@@ -84,6 +84,7 @@ xpDateTime_t DLLCALL xpDateTime_now(void)
 #endif
 }
 
+/* Return local timezone offset (in minutes) */
 xpTimeZone_t DLLCALL xpTimeZone_local(void)
 {
 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DARWIN__)