One year on from the tragic death of her father, Robin Williams, Zelda Williams has written a moving note on Instagram, about depression and hope.
Posting a photo of a moon rising over the lake, Zelda wrote: "I spent this night shivering and laughing under a clear, cold sky full of stars with people I love just to witness something beautiful".
She added: "I came to a realisation this year that I feel compelled to share here, for whomsoever may need it: Avoiding fear, sadness or anger is not the same thing as being happy. I live my sadness every day, but I don't resent it anymore"
"Instead, I do it now so that the wonderful moments of joy I do find are not in order to forget, but to inhabit and enjoy for their own sake. It's not easy. In fact, I'd say it takes much more effort to consciously do than it does to just stay sad, but with all my heart, I cannot tell you how worth it it is."
"And for those suffering from depression, I know how dark and endless that tunnel can feel," wrote Williams. "But if happiness seems impossible to find, please hold on to the possibility of hope, faint though it may be. Because I promise you, there're enough nights under the same yellow moon for all of us to share, no matter how or when you find your way there."
Robin Williams tragically killed himself on August 11, 2014, after suffering from depression.