Do you hear the wedding bells? Oh wait, that’s just angry wedding guests.

From dress codes to rules about who can bring and what food to serve, wedding guests are often not afraid to complain, especially online.

However, one content creator stressed that these celebrations should be entirely tailored to the wishes of the bride and groom – it really isn’t that difficult to follow their instructions for one day.

The man revealed the one rule that a wedding guest should never break.

It’s an easy rule to follow, at least according to a young man named Nick—and it’s necessary to keep the peace when attending a wedding.

“Please make sure you read the wedding invitation card the next time you are invited to a wedding,” he urged. “It will tell you where you are going, what you are wearing and whether or not you are allowed to bring a companion.”

RELATED: Bride accidentally recorded a wedding guest gossiping about her big day, calling it ‘tasteless’ and ‘disrespectful’

While many wedding guests automatically assume they’re allowed to bring a companion, the truth is that every extra person who shows up is a bill the bride and groom have to pay. After months of planning, sending out invitations, getting RSVPs, and booking catering, engaged couples shouldn’t have to worry about uninvited guests showing up on their special day.

Do not bring your children or a companion unless this is specifically mentioned in the invitation.

The only rule guests should follow: Read your invitation and follow it like gospel. While weddings may seem fun and lighthearted, they often require months of planning, thousands of dollars and hours of time spent by couples. Don’t let your ignorance of the rules prevent the day from running smoothly.

School | Shutterstock.com

“Unless the bride and groom have given you the green light to bring someone, you should not bring anyone to the wedding,” Nick added.

According to The Knot, Nick is absolutely right. Inviting a companion is entirely up to the discretion of the bride and groom, but there are some ground rules. Married couples always come as a package deal; usually close friends and family members who are single get the green light to be a guest, and anyone else… well, you might be relegated to the singles table.

Ultimately, it’s the couple’s choice as to who they want to spend their day with. Chances are, messy toddlers and uninvited partners aren’t the people most people would choose.

RELATED: Bride is told she is acting unreasonably after asking her guests to pay a $10 entrance fee and bring their own chairs to her wedding

He admitted that he had been to weddings and had “spoiled” uninvited guests, especially children.

While attending a recent black tie wedding as a wedding guest, Nick was appalled at how many people ignored the wedding invitation and not only brought uninvited companions, but also brought their children to an obviously childless wedding.

“Just read the invitation and follow it,” he repeated. “It’s not difficult. If you don’t have a babysitter, don’t come.”

While all the wedding guests hoped that the children would simply collapse into the corners of the dance floor and sit quietly during the ceremony, unfortunately they did the exact opposite. The wedding guests’ toddlers not only ran onto the dance floor during the bride and groom’s first dance, but also ruined the bride’s dress.

“At the very end of the night, people like to have a farewell reception with sparklers,” he explained. “People line up, you get sparklers and light them, and (the bride and groom) run down and kiss in the middle.”

However, at the wedding he attended, not everything went according to plan and the blame lay with the uninvited children – or more precisely, the parents who had brought them with them.

“One woman’s child was panicking because of all the flames. Maybe he didn’t like it because he’s a little kid,” Nick said. As the bride and groom walked past the child with the sparkler, he reached out and set the hem of the bride’s dress on fire. He then lit blades of grass while his parents stood distractedly by.

At the end of the day, weddings are for the bride and groom, no matter how much the wedding guests try to make it personal. Follow their rules, celebrate them, and respect their wishes – or just don’t come.

RELATED: A mother travels abroad for a wedding and learns that the “child-free rule” applies to her 17-year-old son

Zayda Slabbekoorn is a news and entertainment writer at YourTango, focusing on health and wellbeing, social policy and human stories.