diff --git a/syntax/fle.vim b/syntax/fle.vim
index 6074643..1692ed8 100644
--- a/syntax/fle.vim
+++ b/syntax/fle.vim
@@ -1,29 +1,51 @@
 " Vim Fast Log Entry syntax file
 " Language: Fast Log Entry 
 " Maintainer: Michael Clemens
-" Latest Revision: 2022/10/28
+" Latest Revision: 2022/10/31
 
 if exists("b:current_syntax")
   finish
 endif
 
+" makes all matches/keywords case insensitive
+syntax case ignore
+
+" matches on a date string with a preceeding "date". Example: "date 2022-10-31"
 syn match fle_date /^\s*date \d\{4}-\d\{2}-\d\{2}/
+" matches on a 2 (MM) or 4 (HHMM) digit time string. Example: "1403" or "03"
 syn match fle_time /\(^\s*\)\@<=\(\d\{4}\|\d\{1,2}\)\($\|\s\)/
+" matches on a frequency. Must include a ".". Example: 7.123
 syn match fle_freq /\d\{1,3}\.\d\{3}/
+" matches on call signs including prefixes and suffixes. Example: F/DK1MI/P
 syn match fle_call /\(\S*\/\)*[a-zA-Z0-9]\{1,3}[0-9][a-zA-Z0-9]\{0,3}[a-zA-Z]\(\/\S*\)*/
+" matches on words beginning with "#". Used for locators. Example: #JN49
 syn match fle_loc /#\(\S\+\)/
+" matches on words beginning with "@". Used for operator names. Example: @Mike
 syn match fle_name /@\(\S\+\)/
 
-syn keyword fle_mode ssb cw fm am SSB CW FM AM
-syn keyword fle_mode ft8 ft4 js8 rtty psk31 FT8 FT4 JS8 RTTY PSK31
-syn keyword fle_mode digitalvoice DIGITALVOICE
+" all supported operating modes
+syn keyword fle_mode CW SSB AM FM RTTY FT8 PSK JT65 JT9 FT4 JS8
+syn keyword fle_mode ARDOP ATV C4FM CHIP CLO CONTESTI DIGITALVOICE DOMINO DSTAR
+syn keyword fle_mode FAX FSK441 HELL ISCAT JT4 JT6M JT44 MFSK MSK144
+syn keyword fle_mode MT63 OLIVIA OPERA PAC PAX PKT PSK2K Q15 QRA64
+syn keyword fle_mode ROS RTTYM SSTV T10 THOR THRB TOR V4 VOI
+syn keyword fle_mode WINMOR WSPR 							
+
+" header keywords for the resulting ADIF file header
 syn keyword fle_header mycall mygrid operator qslmsg
 syn keyword fle_header mywwff mysota mypota nickname
-syn keyword fle_band 23cm 70cm 2m 4m 6m
-syn keyword fle_band 10m 12m 15m 17m 20m 30m 40m
-syn keyword fle_band 60m 75m 80m 160m
-syn keyword fle_other day 
 
+" all supportted bands
+syn keyword fle_band 2190m 630m 560m 160m 80m 60m 40m 30m
+syn keyword fle_band 20m 17m 15m 12m 10m 6m 4m 2m 1.25m
+syn keyword fle_band 70cm 33cm 23cm 13cm 9cm 6cm 3cm 1.25cm
+syn keyword fle_band 6mm 4mm 2.5mm 2mm 1mm
+
+" other words that need to be highlighted
+syn keyword fle_other day
+
+" mapping of above matches/keywords to colors
+" customize to your liking
 hi def fle_call ctermfg=blue
 hi def fle_date ctermfg=blue
 hi def fle_other ctermfg=blue