diff --git a/grc/foo_burst_tagger.xml b/grc/foo_burst_tagger.xml
index 2401599..5d5b257 100644
--- a/grc/foo_burst_tagger.xml
+++ b/grc/foo_burst_tagger.xml
@@ -2,7 +2,7 @@
 <block>
   <name>Burst Tagger</name>
   <key>foo_burst_tagger</key>
-  <category>Foo</category>
+  <category>[Foo]</category>
   <import>import pmt</import>
   <import>import foo</import>
   <make>foo.burst_tagger($tag_name, $mult)</make>
diff --git a/grc/foo_packet_dropper.xml b/grc/foo_packet_dropper.xml
index 0c706b8..c9dde4c 100644
--- a/grc/foo_packet_dropper.xml
+++ b/grc/foo_packet_dropper.xml
@@ -2,7 +2,7 @@
 <block>
   <name>Packet Dropper</name>
   <key>foo_packet_dropper</key>
-  <category>Foo</category>
+  <category>[Foo]</category>
   <import>import foo</import>
   <make>foo.packet_dropper($drop_rate, $seed)</make>
   
diff --git a/grc/foo_packet_pad.xml b/grc/foo_packet_pad.xml
index 4ca89e1..9fb5f72 100644
--- a/grc/foo_packet_pad.xml
+++ b/grc/foo_packet_pad.xml
@@ -3,7 +3,7 @@
 <block>
 	<name>Packet Pad</name>
 	<key>foo_packet_pad</key>
-	<category>Foo</category>
+	<category>[Foo]</category>
 	<import>import foo</import>
 	<make>foo.packet_pad($debug, $delay, $delay_sec, $pad_front, $pad_tail)</make>
 
diff --git a/grc/foo_packet_pad2.xml b/grc/foo_packet_pad2.xml
index 23d0a54..a305f91 100644
--- a/grc/foo_packet_pad2.xml
+++ b/grc/foo_packet_pad2.xml
@@ -3,7 +3,7 @@
 <block>
 	<name>Packet Pad2</name>
 	<key>foo_packet_pad2</key>
-	<category>Foo</category>
+	<category>[Foo]</category>
 	<import>import foo</import>
 	<make>foo.packet_pad2($debug, $delay, $delay_sec, $pad_front, $pad_tail)</make>
 
diff --git a/grc/foo_periodic_msg_source.xml b/grc/foo_periodic_msg_source.xml
index 47ca67f..988e9e7 100644
--- a/grc/foo_periodic_msg_source.xml
+++ b/grc/foo_periodic_msg_source.xml
@@ -3,7 +3,7 @@
 <block>
 	<name>Periodic Message Source</name>
 	<key>foo_periodic_msg_source</key>
-	<category>Foo</category>
+	<category>[Foo]</category>
 	<import>import foo</import>
 	<import>import pmt</import>
 	<make>foo.periodic_msg_source($msg, $interval, $num, $quit, $debug)</make>
diff --git a/grc/foo_random_periodic_msg_source.xml b/grc/foo_random_periodic_msg_source.xml
index 1f66960..6817e49 100644
--- a/grc/foo_random_periodic_msg_source.xml
+++ b/grc/foo_random_periodic_msg_source.xml
@@ -3,7 +3,7 @@
 <block>
 	<name>Random Periodic Message Source</name>
 	<key>foo_random_periodic_msg_source</key>
-	<category>Foo</category>
+	<category>[Foo]</category>
 	<import>import foo</import>
 	<import>import pmt</import>
 	<make>foo.random_periodic_msg_source($msg_len, $interval, $num, $quit, $debug, $seed)</make>
diff --git a/grc/foo_rtt_measure.xml b/grc/foo_rtt_measure.xml
index b4d45fe..d83a97a 100644
--- a/grc/foo_rtt_measure.xml
+++ b/grc/foo_rtt_measure.xml
@@ -2,7 +2,7 @@
 <block>
   <name>RTT measure</name>
   <key>foo_rtt_measure</key>
-  <category>Foo</category>
+  <category>[Foo]</category>
   <import>import foo</import>
   <make>foo.rtt_measure($interval)</make>
   
diff --git a/grc/foo_wireshark_connector.xml b/grc/foo_wireshark_connector.xml
index 4f6187e..3744f28 100644
--- a/grc/foo_wireshark_connector.xml
+++ b/grc/foo_wireshark_connector.xml
@@ -2,7 +2,7 @@
 <block>
 	<name>Wireshark Connector</name>
 	<key>foo_wireshark_connector</key>
-	<category>Foo</category>
+	<category>[Foo]</category>
 	<import>import foo</import>
 	<make>foo.wireshark_connector($tech, $debug)</make>