diff --git a/rs41/README.md b/rs41/README.md
index 01a5b49..ac27e5b 100644
--- a/rs41/README.md
+++ b/rs41/README.md
@@ -3,14 +3,14 @@
 
 #### Files
 
-  * `rs41ecc.c`, `RS/ecc/bch_ecc.c`
+  * `rs41ptu.c`, `RS/ecc/bch_ecc.c`
 
 #### Compile
   (copy `bch_ecc.c`) <br />
-  `gcc rs41ecc.c -lm -o rs41ecc`
+  `gcc rs41ptu.c -lm -o rs41ptu`
 
 #### Usage
-  `./rs41ecc [options] <audio.wav>` <br />
+  `./rs41ptu [options] <audio.wav>` <br />
   * `<audio.wav>`: FM-demodulated signal, recorded as wav audio file
   * `options`: <br />
       `-i`: invert signal/polarity <br />
@@ -20,19 +20,24 @@
      `--ecc`: Reed-Solomon error correction <br />
      `--crc`: CRC blocks: 0-OK, 1-NO <br />
      `--sat`: additional Sat data <br />
+     `--ptu`: temperature <br />
 
-  `./rs41gps -h`: list more options
+  `./rs41ptu -h`: list more options
 
 #### Examples
   FSK-demodulation is kept very simple. If the signal quality is low and (default) zero-crossing-demod is used,
   a lowpass filter is recommended:
-  * `sox 20170116_12Z.wav -t wav - lowpass 2800 2>/dev/null | ./rs41ecc --ecc --crc -vx`
+  * `sox 20170116_12Z.wav -t wav - lowpass 2800 2>/dev/null | ./rs41ptu --ecc --crc -vx`
 
   If timing/sync is not an issue, integrating the bit-samples (option `-b`) is better for error correction:
-  * `./rs41ecc -b --ecc --crc -vx 20170116_12Z.wav`
+  * `./rs41ptu -b --ecc --crc -vx 20170116_12Z.wav`
 
   If the signal is inverted
   (depends on sdr-software and/or audio-card/settings), try option `-i`.
 
   (cf. /RS/rs92)
 
+#### older versions
+
+  * `rs41sg.c`, `rs41.c`, `rs41ecc.c`
+