diff --git a/design.tex b/design.tex
index 5fd4026..3bf4844 100644
--- a/design.tex
+++ b/design.tex
@@ -22,13 +22,13 @@ shows the overall work flow of the \wisefi{} system.
 \subsection{Detection}
 \label{subsec:detection}
 
-To detect reciprocal sharing opportunities, two information are required: the
-home AP of the device, and neighbor APs' signal strength during \wifi{} sessions
-with the home AP. A smartphone application can be deployed through app market to
-collect these information. In particular, the home AP information can be learned
-over a period of time using the heuristics developed in
-Section~\ref{subsec:homeap}, or be inputted directly by user. Once the home AP
-information is identified, \wifi{} scan results during sessions with home APs
+To detect reciprocal sharing opportunities, two pieces of information are
+required: the home AP of the device, and neighbor APs' signal strength during
+\wifi{} sessions with the home AP. A smartphone application can be deployed
+through app market to collect these information. In particular, the home AP
+information can be learned over a period of time using the heuristics developed
+in Section~\ref{subsec:homeap}, or be inputted directly by user. Once the home
+AP information is identified, \wifi{} scan results during sessions with home APs
 can then be logged to identify the neighbor APs that can potentially provide
 better network performance. Finally, these information are uploaded and fused in
 \wisefi{} server to identify reciprocal sharing opportunities using the methods