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-rw-r--r--libraries/opal/README2
1 files changed, 2 insertions, 0 deletions
diff --git a/libraries/opal/README b/libraries/opal/README
index 035a8e3b5d..6a7a516728 100644
--- a/libraries/opal/README
+++ b/libraries/opal/README
@@ -5,3 +5,5 @@ networks.
Opal requires ptlib. Speex is also recommended, even though Opal
ships with its own version. x264 and ffmpeg are optional, but
highly recommended, for video support.
+
+Celt is also optional.