using sed

I'm trying to use sed to append "/0.0.0.0" to the end of each line in a file

sed -i 's;$;/0.0.0.0;g' file.txt

problem is most of the time, "/0.0.0.0" is made as a new line after the existing ones, instead of being appended to the ends of the lines

so instead of:
text/0.0.0.0

I get:
text
/0.0.0.0

>>8
What, I found http://www.grymoire.com/Unix/Sed.html to be really helpful when figuring out sed. It's the top hit on google and even has a section titled 'using newlines in sed scripts'