Add C comment that txid_current() assigns an XID if one is not alreadyassigned.
Branch------master
Details-------http://git.postgresql.org/pg/commitdiff/afc9635c600ace716294a12d78abd37f65abd0ea
Modified Files--------------src/backend/utils/adt/txid.c | 3 ++-1 files changed, 2 insertions(+), 1 deletions(-)
