diff --git a/grc/gsm_block_tree.xml b/grc/gsm_block_tree.xml
index 46f96ff..e32121c 100644
--- a/grc/gsm_block_tree.xml
+++ b/grc/gsm_block_tree.xml
@@ -31,6 +31,7 @@
     <cat>
       <name>Decoding</name>
       <block>gsm_control_channels_decoder</block>
+      <block>gsm_tch_f_decoder</block>
     </cat>
     <cat>
       <name>Utilities</name>