Controling spacing between wrapped gloss lines in expex

I'm glossing long lines of text with the expex package. When the glwords wrap to a new line, there doesn't seem to be any space added. For a large block of text it helps to have a little space there. I am able to get more or less what I want by adding a strut in the first lines, but of course this adds a little vertical space above the very first line as well.

\ex[everygla={\rule{0pt}{20pt}}]