Update Console/Receiver/Spectrum Instrumentation m4i.4451/readme.md

Console/Receiver/Spectrum Instrumentation m4i.4451/readme.md

@@ -36,13 +36,13 @@ gfortran -O2 rec_m4i_fifo_tdfilter.f m4iset_extrig_rms.c -mcmodel=medium /usr/li
 ```
 In order to use them you need to provide the receiver frequency range and desired output folder as follows:
 ```console
-rec_m4i_tdfltr 297000000 297000000
+rec_m4i_tdfltr 297000000. 297000000. > Recorded_signal.dat
 ``` 
 The receiver has 10 seconds timeout, which can be adjusted by adjusting the integer in spcm driver function:
 ```c
 spcm_dwSetParam_i32 (hDrv, SPC_TIMEOUT, 10000);
 ```
-If receiver does not detect the trigger, it automatically starts recording 
+If receiver does not detect any trigger, it automatically starts recording. Consequently prints "trigger forced" at the first line of the received signal.
 
 ## References