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-rw-r--r--tests/zero_width_marks_lig.tex3
1 files changed, 3 insertions, 0 deletions
diff --git a/tests/zero_width_marks_lig.tex b/tests/zero_width_marks_lig.tex
index 9dbaac0..2c6dba9 100644
--- a/tests/zero_width_marks_lig.tex
+++ b/tests/zero_width_marks_lig.tex
@@ -10,4 +10,7 @@
% for the second part, the two circles shoud appear clearlybefore the last
% letter, not mixed with it
+% see http://lists.freedesktop.org/archives/harfbuzz/2013-April/003101.html
+% for some technical details.
+
\bye