Description in galleries under an Album

Hi,
with Nextgen Gallery i have created an album, and under this i put four galleries in extended mode. This is the code tha i have write in the page of my site:
[album id=4 template=extend]

Ok, in the page all work well: i see the galleries with the description.
When i click on a single gallery, this appear but i don’t see the description, and i need to see it in the gallery too.
How can i set the plug in to see the description in the gallery?

https://wordpress.org/plugins/nextgen-gallery/