diff --git a/etc/example.conf b/etc/example.conf
index 48102ab7c..f56389fae 100644
--- a/etc/example.conf
+++ b/etc/example.conf
@@ -233,8 +233,9 @@ nodes = {
 	loopback_node = {
 		type = "loopback",			# A loopback node will receive exactly the same data which has been sent to it.
 							# The internal implementation is based on queue.
-		queuelen = 1024				# The queue length of the internal queue which buffers the samples.
-		samplelen = 64				# Each buffered sample can contain up to 64 values.
+		queuelen = 1024,				# The queue length of the internal queue which buffers the samples.
+		samplelen = 64,				# Each buffered sample can contain up to 64 values.
+		mode = "polling"			# Use busy polling for synchronization of the read and write side of the queue
 	},
 	shmem_node = {
 		type = "shmem",
@@ -247,7 +248,7 @@ nodes = {
 		},
 
 		queuelen = 1024,			# Length of the queues
-		polling = true,				# We can busy-wait or use pthread condition variables for synchronizations
+		mode = "pthread",			# We can busy-wait or use pthread condition variables for synchronizations
 		
 		# Execute an external process when starting the node which
 		# then starts the other side of this shared memory channel