Child Tax Credit income limit 2017 vs 2018

Did I read it right? For "Child Tax Credit", TurboTax tells me that:

For 2017: The child tax credit is reduced by $50 for every $1,000 that your adjusted gross income (AGI) exceeds these amounts:

  - Married filing jointly - $110,000

  - Single, head of household or qualifying widow(er) - $75,000

  - Married filing separately - $55,000

But for 2018: These credits are reduced by $50 for every $1,000 that your adjusted gross income (AGI) goes over these amounts:

 - Single, Married Filing Separately, Head of Household, or Qualifying Widow(er) - $200,000

 - Married filing jointly - $400,000


So for married jointly filling, the AGI limit is raised by almost 4 time??? (from $110K to $400K?) That sounds a lot so want to confirm.


Thanks!