This info is currently in the "About," in bold:
William is Referred to as Chief Donaho in the Bexar Co Archives, San Antonio, Bexar, Texas USA. Played a part in helping Rachal Plummer return to her Parker family after being captured by the Comanches.
We have two issues here:
1) The Bexar County Archives are indexed and available via a digital search, including land records all the way back to 1753. I can't personally find anything for a "Chief Donaho" or "Chief William Donaho," even though other records involving honorifics do exist. Do we know the specific record being referenced? Or would someone else like to try their hand at searching?
2) The wealthy merchant who aided Rachel Plummer was known as "Col. William Donoho," not "Chief William Donaho." Per A Fate Worse Than Death: Indian Captivities in the West, 1830-1885 (p. 22), Col. William Donoho came from Missouri, with some time spent in Santa Fe; his wife's mother was known to be living Pulaski County, Missouri at the time of the rescue; and the Donohos moved to Missouri (where Mary was raised) following the rescue. Per Empire of the Summer Moon: Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History (p. 123), Col. William and his Mary were full U.S. citizens, wealthy, and had the "first Anglo children born" in Santa Fe while they were living there. Texas Tales: Stories That Shaped a Landscape and a People (p. 77) agrees that they were part of the wealthy white establishment in Santa Fe. Per the dates on Col. William Donoho's stone, he was born in 1798 and died in 1846. And a biography of Col. William Donoho's wife, Mary Donoho: New First Lady of the Santa Fe Trail, identifies her as Mary Dodson -- not Mary Gilliand, which is what this tree is showing as wife.
So that William Donoho does not appear to be a match for William Donaho who came from South Carolina and spent the final years of his life in Texas. And because it's so clearly a mixup, I'm going to go ahead and remove that line from this profile without waiting for further discussion, and I'm going to add a note to the "About" explaining that they're different people.