Update ReadMe.md

ReadMe.md

@@ -28,10 +28,12 @@ For detailed specifications, pinout, and connection diagrams, please refer to th
   - Download the library: `svn co https://devel.iri.upc.edu/pub/labrobotica/drivers/usb_i2c_adapter/trunk usb_i2c_adapter`
   - Compile and install: `cd usb_i2c_adapter/build && cmake -D CMAKE_BUILD_TYPE=RELEASE .. && make -j $(nproc) && sudo make install`
 
-- [FTDI driver](http://www.ftdichip.com/Drivers/D2XX.htm) - (Optional)
+- [FTDI driver](http://www.ftdichip.com/Drivers/D2XX.htm) - (Required only if not previously installed)
 
   - Download the FTDI driver depending on your ubuntu distribution: http://www.ftdichip.com/Drivers/D2XX.htm 
   - Install the driver: http://www.ftdichip.com/Support/Documents/AppNotes/AN_220_FTDI_Drivers_Installation_Guide_for_Linux.pdf
+  - Add the following line at the end of your `~/.bashrc` file: `export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH`
+
 
 ### Installation