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-rw-r--r--stream/tvi_vbi.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/stream/tvi_vbi.c b/stream/tvi_vbi.c
index a7ea54a494..21c3196bdc 100644
--- a/stream/tvi_vbi.c
+++ b/stream/tvi_vbi.c
@@ -24,6 +24,9 @@
* (decode_raw_line_runin,pll_add,pll_reset) of MythTV project.
* Code for calculating [soc:eoc] is based on aletv of Edgar Toernig.
*
+ * Teletext system is described in
+ * ETS 300 706 "Enhanced Teletext specification" : May 1997
+ * http://www.themm.net/~mihu/linux/saa7146/specs/ets_300706e01p.pdf
*
* Some implementation details:
* How to port teletext to another tvi_* driver (see tvi_v4l2.c for example):