how to fix malformed entries in a list

I am getting this message
E : Malformed entry 53 in list file /etc/apt/sources.list

Line 53 and 54 in the list are :
line 53 : deb https://dl.winehq.org/wine-builds/ubuntu/bionic main
line 54 : # deb-src https://dl.winehq.org/wine-builds/ubuntu/bionic main

what is the correct entry for this line else how can i fix it?
Please Help