diff --git a/TS-0019-Abstract_Test_Suite_&_implementation_eXtra_Information_for_Test.md b/TS-0019-Abstract_Test_Suite_&_implementation_eXtra_Information_for_Test.md
index 151a06efd28d46cb374c5cadf4074b2c2064164c..3474ab6051ee23a66d51d6c52a3a343efac7f2d3 100644
--- a/TS-0019-Abstract_Test_Suite_&_implementation_eXtra_Information_for_Test.md
+++ b/TS-0019-Abstract_Test_Suite_&_implementation_eXtra_Information_for_Test.md
@@ -217,7 +217,7 @@ APTs used by the oneM2M test suite are described in figure 5.1-1. The test syste
 **Figure 5.1-1: Abstract protocol testers - oneM2M**
 
 
-As figure 5.1-1 illustrates, the corresponding ATS needs to use lower layers to establish a proper connection to the system under test (SUT) over a physical link (Lower layers link). Four different lower layers have been specified corresponding to the binding protocols considered in oneM2M: HTTP, CoAP, WebSocket and MQTT.
+As figure 5.1-1 illustrates, the corresponding ATS needs to use lower layers to establish a proper connection to the system under test (SUT) over several physical links (Lower layers link). Four different lower layers have been specified corresponding to the binding protocols considered in oneM2M: HTTP, CoAP, WebSocket and MQTT.
 
 This is a demo for markdown spec.