Would you have realized that there was material after "that is his name." and before his signature if it had not been mentioned in this post?
I'm not saying that individuals intentionally publish modified images of records on their blogs. But it would not be difficult to remove something "unsavory" from a document image before posting the image to a personal blog or website.
This is one reason why a citation to an image should include the actual website where it was located in addition to the location of the original document (if known).
And this is why if I ever decide again to "edit" a document image, I'll make notations of some type on the actual image itself.
Note: this affidavit was made out by Focke J. Goldenstein in the completion of his 1880 era homestead claim in Dawson County, Nebraska. The original was obtained at the National Archives.