diff --git a/python-core.tex b/python-core.tex
index 8039fad..148dd26 100755
--- a/python-core.tex
+++ b/python-core.tex
@@ -2071,6 +2071,7 @@ draw = ImageDraw.Draw(image)
 # drawing text size
 text = "hello"
 font = ImageFont.truetype(r'C:\Users\System-Pc\Desktop\arial.ttf', 20) 
+## ubuntu -- font can be found with fc-list command
 draw.text((5, 5), text, fill ="red", font = font, align ="right") 
 image.save('test.png')
 \end{python}