-If you upgrade from version 0.12.0 or 1.0.x, you shouldn't have
-any problems. However, in the source we have begun a transition
-to use ANSI C++ more and this can make it hard or impossible to
-compile LyX on old or non-conformant compilers. If the compile is
-successfull everything should be just like in 1.0.4. Just run
-"make install", and it will automatically update the necessary
-files, provided that you install LyX the same place as
-an existing version.
+If you upgrade from version 1.1.6 or 1.1.5, you shouldn't have any
+problems. It is nevertheless a good idea to advise all users to run
+Edit>Reconfigure.
+
+If you have your own layout files, you may need to update them a little:
+
+- all layout files should have a "DefaultStyle" entry
+
+- the "Latex" font style does not exist anymore. If you really need
+ its functionality, consider using the "PassThru" keyword instead.
+
+The new layout format keywords are described in the Customization
+manual.