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diff --git a/gis/osgEarth/README b/gis/osgEarth/README
index cd087079f6..ba1b2a6b46 100644
@@ -4,3 +4,6 @@ OpenSceneGraph application, and go!
osgEarth supports all kinds of data and comes with lots of examples to help you
get up and running quickly and easily.
+Optional requirements protobuf and rocksdb are recommended for enhanced
+performance. They will be used if detected when osgEarth is built.