Update CEC CTS README to clarify cec-client installation

Change-Id: I97eb6719293d28233c1966cac541713f416b5a75
diff --git a/hostsidetests/hdmicec/README.md b/hostsidetests/hdmicec/README.md
index f8289b2..cf85027 100644
--- a/hostsidetests/hdmicec/README.md
+++ b/hostsidetests/hdmicec/README.md
@@ -14,8 +14,9 @@
 Running these CTS tests requires a specific HDMI layout with a CEC adapter.
 
 *   Android TV playback device
-*   CEC adapter see [External CEC Adapter instructions](cec_adapter.md)
-*   HDMI Display (aka a TV)
+*   CEC adapter, see [External CEC Adapter instructions](cec_adapter.md)
+*   Install `cec-client` binary, see [install instructions](cec_adapter.md#software)
+*   HDMI Display (aka a TV) or an HDMI fake plug
 
 ![drawing](setup.png)
 
diff --git a/hostsidetests/hdmicec/cec_adapter.md b/hostsidetests/hdmicec/cec_adapter.md
index 3a325d7..409a84e 100644
--- a/hostsidetests/hdmicec/cec_adapter.md
+++ b/hostsidetests/hdmicec/cec_adapter.md
@@ -21,7 +21,7 @@
     sudo apt-get install cec-utils
     ```
 
-    *   mac (using [MacPorts](https://guide.macports.org/#installing))
+    *   macOS (using [MacPorts](https://guide.macports.org/#installing))
 
     ```shell
      sudo /opt/local/bin/port install libcec