diff --git a/README.md b/README.md
index 06ff638..03200dd 100644
--- a/README.md
+++ b/README.md
@@ -161,7 +161,9 @@
 =======
 *Piotr Krysik* \<ptrkrysik (at) gmail.com\> - main author and project maintainer
 
-*Steve* \<steve (at) segfault.net\>  - functions for decoding channel codes
+*Roman Khassraf* \<rkhassraf (at) gmail.com\> - blocks for demultiplexing and decoding of voice channels
+
+*Steve* \<steve (at) segfault.net\>  - functions for decoding control channels
 
 
 Thanks
diff --git a/include/grgsm/misc_utils/message_printer.h b/include/grgsm/misc_utils/message_printer.h
index b7f3293..3914707 100644
--- a/include/grgsm/misc_utils/message_printer.h
+++ b/include/grgsm/misc_utils/message_printer.h
@@ -25,7 +25,7 @@
 #define INCLUDED_GSM_MESSAGE_PRINTER_H
 
 #include <grgsm/api.h>
-#include <gnuradio/sync_block.h>
+#include <gnuradio/block.h>
 
 namespace gr {
   namespace gsm {
diff --git a/python/receiver/gsm_input.py b/python/receiver/gsm_input.py
index 16df5c3..47edcc5 100644
--- a/python/receiver/gsm_input.py
+++ b/python/receiver/gsm_input.py
@@ -41,8 +41,8 @@
         self.low_pass_filter_0_0 = filter.fir_filter_ccf(1, firdes.low_pass(
         	1, samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
         self.gsm_clock_offset_corrector_0 = grgsm.clock_offset_corrector(
-            fc=936.6e6,
-            ppm=0,
+            fc=fc,
+            ppm=ppm,
             samp_rate_in=samp_rate_in,
         )
         self.fractional_resampler_xx_0 = filter.fractional_resampler_cc(0, samp_rate_in/samp_rate_out)