diff --git a/etc/labs/lab20.conf b/etc/labs/lab20.conf
index 0d9746318..7299dfc7d 100644
--- a/etc/labs/lab20.conf
+++ b/etc/labs/lab20.conf
@@ -3,15 +3,15 @@
 
 nodes = {
     tcp_node = {
-        type = "socket",
+        type = "socket"
 
-        layer = "tcp-client",
+        layer = "tcp-client"
 
-        format = "villas.human",
+        format = "villas.human"
 
         in = {
             address = "tcpbin.com:4242"
-        },
+        }
         out = {
             address = "tcpbin.com:4242"
         }
@@ -19,18 +19,18 @@ nodes = {
     siggen = {
         type = "signal"
         signal = [ "sine", "pulse", "square" ]
-        values = 3, # value per sample
-        rate = 1, # rate of sample
+        values = 3 # Values per sample
+        rate = 1 # Sample rate
     }
 }
 paths = (
     {
         in = "siggen"
-        out = "tcp_node",
+        out = "tcp_node"
         hooks = ( { type = "print" } )
     },
     {
-        in = "tcp_node", # Receive loopback answer.
+        in = "tcp_node" # Receive loopback answer.
         hooks = ( { type = "print" } )
     }
 )