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diff --git a/graphics/darktable/README b/graphics/darktable/README
index f51453f187..c1a6bcfcd8 100644
--- a/graphics/darktable/README
+++ b/graphics/darktable/README
@@ -5,13 +5,23 @@ and enhance them. This project tries to fill the gap between the many
excellent existing free raw converters and image management tools (such
as ufraw or f-spot).
+
+Upgrading from 2.0.x
+
+When upgrading from the 2.0.x series, your edits will be preserved, but
+it will not be possible to downgrade from 2.2 to 2.0.x.
+
+
+i686 build
+
The Darktable project strongly recommends that you should build and run
darktable on x86_64 if possible. The i686 build will not give you a
satisfactory user experience. As an absolute minimum, your processor
must support SSE2 instructions (i.e. Pentium 4 or higher, or Athlon 64
or higher).
-The following are optional dependencies:
+
+Optional dependencies
GraphicsMagick - for importing a wide range of non-RAW image formats
libwebp - for exporting images in WebP format
@@ -20,6 +30,7 @@ json-glib - for exporting images to Facebook
colord - for colour profile management
colord-gtk - for colour profile management
osm-gps-map - for map georeferencing
+jsonschema - for checking noise profiles
If you have nVidia or AMD/ATI graphics with more than 1Gb of memory,
either nvidia-driver or amd-app-sdk is an optional runtime dependency.