How to stop showing AvialMem value

I try to use the Radaee PDF library 3.1,but when i used it it shows me a text value for named AvialMem each pdf file.I found that it comes from PDFReader class inside library.Then i commented out the below line.

canvas.drawText( "AvialMem:" + info.availMem/(1024*1024) + " M", 20, 150, m_info_paint);

Then it doesn't show me that value.What is this value shows?
Is it ok to comment that line to prevent showing it ?

yes, it is OK.
these codes placed here, due to debug and monitor memory usage info.