diff --git a/README.md b/README.md
index debcc62..8f76b1a 100644
--- a/README.md
+++ b/README.md
@@ -11,13 +11,17 @@ RS
   `RS/dropsonde`: RD94 <br />
   `RS/m10`: M10 <br />
   `RS/dfm`: DFM-06, DFM-09 <br />
-  `RS/imet`: iMet-1-AB, iMet-1-RS <br />
+  `RS/imet`: iMet-1-AB, iMet-1-RS (iMet-4) <br />
   `RS/c34`: C34, C50 <br />
-  `RS/lms6`: LMS6 <br />
-  `RS/mk2a`: MkIIa <br />
+  `RS/lms6`: LMS6 (403 MHz) <br />
+  `RS/mk2a`: MkIIa (LMS6-1680MHz) <br />
   `RS/meisei`: Meisei <br />
 
-  `RS/rs_module`: separate Module, z.Z. RS92, RS41 <br />
+  `RS/demod`: alternative decoders using cross-correlation for header-synchronization <br />
+
+  `RS/ecc`: error correction codes (Reed-Solomon/BCH) <br />
+
+  `RS/rs_module`: separate Module, z.Z. RS92, RS41 (not up-to-date)<br />
 
 
   Die Decoder erwarten das FM-demodulierte wav-Audio des empfangenen Signals (kann auch mit 
@@ -27,8 +31,6 @@ Oft hilft schon, z.B. mit sox einen lowpass-Filter zwischenzuschalten (fuer C34/
 wird DFT verwendet). Je nach Empfangsgeraet oder SDR-Software kann das Signal invertiert sein 
 (ebenso fuer neuere DFM-09 gegenueber DFM-06).
 
-  `RS/ecc` - error correction codes (Reed-Solomon/BCH) <br />
-
 
 * Diverses:
 
@@ -51,4 +53,12 @@ wird DFT verwendet). Je nach Empfangsgeraet oder SDR-Software kann das Signal in
   http://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=1000#p88325  
   http://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=1000#p88845  
   http://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=1850#p155677  
+  http://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=1975#p163997  
+  http://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=2300#p193107  
+  https://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=2325#p196322  
+  https://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=2400#p198064  
+  https://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=2425#p203315  
+  https://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=2825#p235868  
+  https://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=43&start=2875#p245177  
+
 
diff --git a/demod/README.md b/demod/README.md
new file mode 100644
index 0000000..a638107
--- /dev/null
+++ b/demod/README.md
@@ -0,0 +1,27 @@
+
+## Radiosonde decoders
+
+alternative decoders using cross-correlation for better header-synchronization
+
+#### Files
+
+  * `demod_dft.c`, `demod_dft.h`, <br />
+    `rs41dm_dft.c`, `rs92dm_dft.c`, `dfm09dm_dft.c`, `m10dm_dft.c`, `lms6dm_dft.c`, <br />
+    `RS/ecc/bch_ecc.c`
+
+#### Compile
+  (copy `bch_ecc.c`) <br />
+  `gcc -c demod_dft.c` <br />
+  `gcc rs41dm_dft.c demod_dft.o -lm -o rs41dm_dft` <br />
+  `gcc dfm09dm_dft.c demod_dft.o -lm -o dfm09dm_dft` <br />
+  `gcc m10dm_dft.c demod_dft.o -lm -o m10dm_dft` <br />
+  `gcc lms6dm_dft.c demod_dft.o -lm -o lms6dm_dft` <br />
+  `gcc rs92dm_dft.c demod_dft.o -lm -o rs92dm_dft` (needs `RS/rs92/nav_gps_vel.c`)
+
+#### Usage/Examples
+  `./rs41dm_dft --ecc2 --crc -vx --ptu <audio.wav>` <br />
+  `./dfm09dm_dft --ecc -v --ptu <audio.wav>` (add `-i` for dfm06)<br />
+  `./m10dm_dft --dc -vv --ptu -c <audio.wav>` <br />
+  `./lms6dm_dft --vit --ecc -v <audio.wav>` <br />
+
+
diff --git a/lms6/README.md b/lms6/README.md
new file mode 100644
index 0000000..0541f69
--- /dev/null
+++ b/lms6/README.md
@@ -0,0 +1,34 @@
+
+## Radiosonde LMS6
+
+LMS6 (403 MHz) <br />
+(for 1680 MHz 9600 bit/s try /RS/mk2a)
+
+FSK 4800 bit/s <br />
+R=1/2 K=7 convolutional code, Reed-Solomon RS(255,223)-blocks (CCSDS)
+
+#### Files
+
+  * `lms6ccsds.c`, `RS/ecc/bch_ecc.c`
+
+#### Compile
+  (copy `bch_ecc.c`) <br />
+  `gcc lms6ccsds.c -lm -o lms6ccsds`
+
+#### Usage
+  `./lms6ccsds -b -v --vit --ecc <audio.wav>` <br />
+  * `<audio.wav>`: FM-demodulated signal, recorded as wav audio file
+  * `options`: <br />
+      `-b`: integrate bit-samples <br />
+      `-r`: output raw data <br />
+      `-v`: additional data (sonde-ID) <br />
+     `--vit`: Viterbi decode <br />
+     `--ecc`: Reed-Solomon error correction <br />
+
+Integrating bit-samples is better for error correction. Good synchronization is important. Correlation locates
+block/frame start even better (cf. /RS/demod).
+
+#### older versions
+
+  * `lms6.c`, `lms6ecc.c`
+