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+++ b/Documentation/fb/modedb.rst
@@ -26,6 +26,11 @@ Valid mode specifiers (mode_option argument)::
with <xres>, <yres>, <bpp> and <refresh> decimal numbers and <name> a string.
Things between square brackets are optional.
+Valid names are::
+
+ - NSTC: 480i output, with the CCIR System-M TV mode and NTSC color encoding
+ - PAL: 576i output, with the CCIR System-B TV mode and PAL color encoding
+
If 'M' is specified in the mode_option argument (after <yres> and before
<bpp> and <refresh>, if specified) the timings will be calculated using
VESA(TM) Coordinated Video Timings instead of looking up the mode from a table.