diff --git a/README.md b/README.md
index d6efcec..c8e0512 100755
--- a/README.md
+++ b/README.md
@@ -2,6 +2,6 @@ This library is a P/Invoke wrapper for Win32API serial port.
 
 Originally copied from http://msdn.microsoft.com/en-us/magazine/cc301786.aspx that I guess licensed under Ms-PL so this project is also under Ms-PL. (Update: well, after the years now I think this was not a true claim, but well I don't think MS will sue anyone because a sample intended for public use)
 
-It useful in cases System.IO.Ports.SerialPort is not working well (for connecting to \\\\.\\... devices)
+It is useful in the cases System.IO.Ports.SerialPort is not working well (for connecting to \\\\.\\... devices)
 
 Download it from https://nuget.org/packages/PInvokeSerialPort :)