Before a performance, you might see warnings about smoke, strobe lights, loud booms and even adult content.

The New York Times recently reprted these advisories are a growing trend at theaters in the United States, but the Theatre Company at the Denver Center for the Performing Arts said these warnings are nothing new to them.

"We have included audience advisories for years, far before my time," said Emily Kent, the director of marketing of the Theatre Company.

Only now, the advisories are far more specific and Kent said many of them were made at the request of their patrons.

"Folks who have any kind of sensory issue, whether it's something, if they're epileptic, whether they have a seizure, or if they might have something like PTSD," she said.

Some people may call them spoilers, the theater company doesn't see it that way.

They equate them to the ratings you get before you watch a movie or TV show, like PG, PG-13 or R.

"In general, I think most of content advisories do not reach into that territory," Kenet said. "Just like when you turn on your TV and you see language, violence, you know, sexual situations, we're kind of staying in that level that high level advisory that we don't consider to be spoilery."

And the team says with those very specific warnings, they take extra steps to avoid spoilers.

"We now have a feature on our website where you can view exact timings that will say 13 minutes into act one. strobe light, an hour and 10 minutes into act two, a loud explosion," Kent said. "At the same time we recognize that might be a spoiler for someone right, like gunshot at the end of act two is kind of a big, dramatic moment so that's why we've made them something that a patron has to click on to view."

Kent added determining what needs an advisory for their performances is a collaborative process involving several teams within the company, including the marketing team, the box office team and the producers.

But when it comes to the Broadway national tours, that's out of their hands.

The producers that travel with those shows bring their own advisories along with them.