Update README.md

Author: rossmann-engineering

README.md

@@ -2,7 +2,7 @@
 
 Modbus TCP, Modbus UDP and Modbus RTU client/server library for .NET
 
-Download Library and tools: <a href="https://sourceforge.net/projects/easymodbustcp/files/latest/download" rel="nofollow"><img alt="Download EasyModbusTCP/UDP/RTU .NET" src="https://a.fsdn.com/con/app/sf-download-button"></a>
+Download Library (*.DLL) and tools: <a href="https://sourceforge.net/projects/easymodbustcp/files/latest/download" rel="nofollow"><img alt="Download EasyModbusTCP/UDP/RTU .NET" src="https://a.fsdn.com/con/app/sf-download-button"></a>
 
 For JAVA-Version see: https://sourceforge.net/projects/easymodbustcp-udp-java/