diff --git a/test/TEST_TX.py b/test/TEST_TX.py
index 4eaf1852..c07436c5 100644
--- a/test/TEST_TX.py
+++ b/test/TEST_TX.py
@@ -13,6 +13,7 @@ import binascii #required for string.to_bytes() function
 import sys
 
 
+
 def main():
     
     modem = FreeDV() #Load FreeDV Class as "modem"
@@ -55,15 +56,15 @@ class FreeDV():
             buffer[:len(data_list[i])] = data_list[i] # set buffersize to length of data which will be send
 
             crc = c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), self.payload_per_frame))     # generate CRC16
-            crc = crc.value.to_bytes(2, byteorder='big') # convert buffer to 2 byte hex string
+            crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
             buffer += crc        # append crc16 to buffer
                 
-            data = self.FrameBytes().from_buffer_copy(buffer) #change data format form bytearray to ctypes.u_byte
+            data = self.FrameBytes().from_buffer_copy(buffer) #change data format from bytearray to ctypes.u_byte
     
-            self.c_lib.freedv_rawdatatx(self.freedv,mod_out,data) # modulate DATA      
+            self.c_lib.freedv_rawdatatx(self.freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer     
 
-            sys.stdout.buffer.write(mod_out)    # the normal way of piping data
-            sys.stdout.flush() # flushing data
+            sys.stdout.buffer.write(mod_out)    # print data to terminal for piping the output to other programs
+            sys.stdout.flush() # flushing stdout
 
 
 main()
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