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diff --git a/cmd/Commands_en.hlp b/cmd/Commands_en.hlp
index d789a51e..f11b6b2a 100644
--- a/cmd/Commands_en.hlp
+++ b/cmd/Commands_en.hlp
@@ -468,6 +468,51 @@ string to see a selection of files in a filearea eg:-
 
 See also TYPE - to see the contents of a file.
 
+=== 0^SHOW/MUF <prefix> [<hours>]^Show the likely propagation to a prefix
+This command allow you to estimate the likelyhood of you contacting
+a station with the prefix you have specified. The output assumes a modest
+power of 20dBW and receiver sensitivity of -123dBm (about 0.15muV/10dB SINAD)
+
+The command will display some header information detailing its
+assumptions, together with the locations, latitude and longitudes and
+bearings. It will then show UTC (UT), local time at the other end
+(LT), calculate the MUFs, Sun zenith angle at the midpoint of the path
+(Zen) and the likely signal strengths. Then for each frequency for which
+the system thinks there is a likelihood of a circuit it prints a value.
+
+The value is currently a likely S meter reading based on the conventional
+6dB / S point scale. If the value has a '+' appended it means that it is
+1/2 an S point stronger. If the value is preceeded by an 'm' it means that
+there is likely to be much fading and by an 's' that the signal is likely
+to be noisy.  
+
+By default SHOW/MUF will show the next two hours worth of data. You
+can specify anything up to 24 hours worth of data by appending the no of
+hours required after the prefix. For example:-
+
+  SH/MUF W
+
+produces:
+
+  RxSens: -123 dBM SFI: 159   R: 193   Month: 10   Day: 21
+  Power :   20 dBW    Distance:  6283 km    Delay: 22.4 ms
+  Location                       Lat / Long           Azim
+  East Dereham, Norfolk          52 41 N 0 57 E         47
+  United-States-W                43 0 N 87 54 W        299
+  UT LT  MUF Zen  1.8  3.5  7.0 10.1 14.0 18.1 21.0 24.9 28.0 50.0
+  18 23 11.5 -35  mS0+ mS2   S3
+  19  0 11.2 -41  mS0+ mS2   S3
+
+indicating that you will have weak, fading circuits on top band and 
+80m but usable signals on 40m (about S3).
+
+inputing:-
+
+  SH/MUF W 24
+
+will get you the above display, but with the next 24 hours worth of
+propagation data.
+
 === 0^SHOW/PREFIX <callsign>^Interrogate the prefix database 
 This command takes the <callsign> (which can be a full or partial 
 callsign or a prefix), looks up which internal country number