People walk into a house for sale in Floral Park, Nassau County, New York.
Wang Ying | Xinhua News Agency | Getty Images
Home price increases slowed ever so slightly in April, but it is the first potential sign of a cooling in prices.
Prices rose 20.4% nationally in April compared with the same month a year ago, according to the S&P CoreLogic Case-Shiller Index. In March, home prices grew 20.6%. The last slight deceleration was in November of last year.
The 10-city composite annual increase was 19.7%, up from 19.5% in March. The 20-city composite posted a 21.2% annual gain, up from 21.1% in the previous month.
In a change from the last five months, when most of the 20 cities saw…