[doc] add note concerning state of feature file support

As suggested by @Crissov,
https://github.com/lualatex/luaotfload/issues/200#issuecomment-35163810

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/luaotfload-main.tex b/doc/luaotfload-main.tex
index 37127b7..f5a068d 100644
--- a/doc/luaotfload-main.tex
+++ b/doc/luaotfload-main.tex
@@ -581,6 +581,13 @@ obviously, |random|.
        The syntax is documented in \identifier{Adobe}’s
        \OpenType Feature File Specification.\footnote{%
          Cf. \url{http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html}.
+				 Feature file support is part of the engine which at the
+				 time of this writing (2014) implements the spec only
+				 partially.
+				 See the
+				 \href{http://tracker.luatex.org/view.php?id=231}
+              {\LUATEX tracker}
+					for details.
        }
 
        For a demonstration of how to set a |tkrn| feature consult