diff --git a/grc/gsm_block_tree.xml b/grc/gsm_block_tree.xml
index 786d7d2..b056003 100644
--- a/grc/gsm_block_tree.xml
+++ b/grc/gsm_block_tree.xml
@@ -50,6 +50,7 @@
       <name>Decoding</name>
       <block>gsm_control_channels_decoder</block>
       <block>gsm_tch_f_decoder</block>
+      <block>gsm_tch_h_decoder</block>
     </cat>
     <cat>
       <name>Flow control</name>