1 files changed, 1 insertions, 1 deletions
diff --git a/example.t b/example.t
index 1cf8730..98b4340 100644
--- a/example.t
+++ b/example.t
@@ -19,7 +19,7 @@ References
 %tr	Edward Stankiewicz
 %ci	Bloomington
 %pu	Indiana University Press
-%??	Extra information
+%xx	Extra information
 .XP
 %au	Lesk, M. E.
 %ti	Some Applications of Inverted Indexes on the UNIX System