+# Incremented to format 12, by vfr
+# Add option to use the system's theme icons
+# No conversion necessary.
+
+# Incremented to format 13, by bh
+# Rename mac_like_word_movement to mac_like_cursor_movement
+
+# Incremented to format 14, by spitz
+# New RC default_otf_view_format
+# No conversion necessary.
+
+# Incremented to format 15, by prannoy
+# Add fullscreen_statusbar
+# No conversion necessary.
+
+# Incremented to format 16, by lasgouttes
+# Remove force_paint_single_char rc.
+
+# Incremented to format 17, by lasgouttes
+# Remove rtl_support rc.
+
+# Incremented to format 18, by ef
+# Add option to allow saving the document directory
+# No conversion necessary.
+
+# Incremented to format 19, by rgh
+# remove print support
+
+# Incremented to format 20, by tommaso
+# Add options to forbid/ignore 'needauth' option
+# No conversion necessary.
+
+# Incremented to format 21, by spitz
+# Add jbibtex_alternatives, allow "automatic" value
+# of bibtex_command and jbibtex_command (actually the
+# default now)
+# No conversion necessary.
+
+# Incremented to format 22, by ef
+# Add pygmentize_command for the python pygments syntax highlighter
+# No conversion necessary.
+
+# Incremented to format 23, by spitz
+# Add default_platex_view_format, a default output format for
+# Japanese documents via pLaTeX.
+# No conversion necessary.
+
+# Incremented to format 24, by spitz
+# Rename collapsable to collapsible
+
+# Incremented to format 25, by lasgouttes
+# Remove use_qimage preference
+
+# Incremented to format 26, by spitz
+# Rename font_encoding preference
+
+# Incremented to format 27, by spitz
+# Add optional flavor value to needaux flag
+
+# Incremented to format 28, by spitz
+# Remove date_insert_format
+
+# NOTE: The format should also be updated in LYXRC.cpp and
+# in configure.py.
+