How can I write the specific content in the file through shell script

Shell Programming and Scripting
1

Hello,

I need to do one thing that my script creates the file

touch release.SPLASH_12_03_00_RC01.txt

Now I want to update that file with some content e.g

splashbuild::SPLASH_12_17_00_RC02.zip

Thanks

2 
echo "splashbuild::SPLASH_12_17_00_RC02.zip" >> release.SPLASH_12_03_00_RC01.txt