Former Housing and Urban Development Secretary Julián Castro was the first 2020 Democratic presidential candidate to mark International Pronouns Day Wednesday.

“Using someone’s correct pronouns—and giving your own—isn’t difficult. I’m Julián Castro, he/him/él,” Castro tweeted.

“It takes one extra breath to help people feel seen and respected. I think that’s worth it. #PronounsDay” he continued.

Using someone’s correct pronouns—and giving your own—isn’t difficult.



I’m Julián Castro, he/him/él.



It takes one extra breath to help people feel seen and respected. I think that’s worth it. #PronounsDay pic.twitter.com/02v65k3HXx — Julián Castro (@JulianCastro) October 16, 2019

"Someone reminded us that it really is hard for some people, and can trigger anxiety or dysphoria. I’m grateful to learn how to be more inclusive of people all genders," Castro also tweeted.

Someone reminded us that it really is hard for some people, and can trigger anxiety or dysphoria. I’m grateful to learn how to be more inclusive of people all genders. — Julián Castro (@JulianCastro) October 16, 2019

But Castro was not the only 2020 candidate to embrace introducing himself with his pronouns. Sens. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.), Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) and Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), alongside businessman Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE, all include their pronouns in their bios on Twitter.

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Charlotte Clymer, the press secretary for rapid response at the Human Rights Campaign, tweeted that South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D) also included his pronouns in his Twitter bio, although it was not immediately clear when the pronouns were added.

International Pronouns Day was marked Wednesday to “make respecting, sharing, and educating about personal pronouns commonplace,” according to the day’s website. It began in 2018.

“Referring to people by the pronouns they determine for themselves is basic to human dignity. Being referred to by the wrong pronouns particularly affects transgender and gender nonconforming people. Together, we can transform society to celebrate people’s multiple, intersecting identities,” the website said.