diff --git a/v1.3.1/README.org b/v1.3.1/README.org
index cbbf789..6fd6a2e 100644
--- a/v1.3.1/README.org
+++ b/v1.3.1/README.org
@@ -49,6 +49,9 @@ The following mobile terminals can be used:
 - eee :: Asus EeePC 1001-PX (Atheros AR2427 Wi-Fi chipset, Linux
          3.0.0).
 
+When received by a Fonera 2.0, the default packet size is 103 bytes for
+a positioning request, and 116 bytes for an (auto)calibration request.
+
 
 * Testing area
 
@@ -140,7 +143,7 @@ transmit autocalibration requests, it must be known by the
 Aggregator. Therefore, it is not sufficient to wait for 10 seconds
 (cf. Measurement procedure) after starting the Aggregator to guarantee
 that each capture point transmits autocalibration requests for 10
-seconds. The counter must be started after the Aggregator received an
+seconds. The counter must be started after the Aggregator received a
 Hello message from all the capture points.
 
 At the end of a test, beware of not stopping the Aggregator too early,
@@ -189,11 +192,11 @@ The mobile terminal's antenna is vertical.
   stack of small boxes (75 cm).
 - When a human operator carries the mobile terminal, the altitude of the
   terminal is 1 m (hips/belly).
-- The antenna of the capture points and the mobile terminal are
-  vertical. When the mobile terminal is a laptop computer, the screen is
-  vertical, and the computer is set up so that the display side of the
-  screen is in direction of the wall opposite to the point where the
-  mobile is located (when applicable).
+- The antenna of the mobile terminal is vertical. When the mobile
+  terminal is a laptop computer, the screen is vertical, and the
+  computer is set up so that the display side of the screen is in
+  direction of the wall opposite to the point where the mobile is
+  located (when applicable).
 
 ** Measurement procedure
 
@@ -222,7 +225,7 @@ Repeat the scenario 1, but the mobile terminal is on the floor.
 
 ** Scenario 3
 
-This scenario tests the antenna angles and measurement direction, with a
+This scenario tests the antenna angle and measurement direction, with a
 human operator. The measurement points 2 and 5 are tested.
 
 For each point, measurements are taken in two directions, with a 45°