Answer: All of the CC 4.0 licenses (not just SA) require you say what you modified in the attribution statement: https://creativecommons.org/faq/#how-do-i-properly-attribute-material-offered-under-a-creative-commons-license You must also indicate if you have modified the work—for example, if you have taken an excerpt, or cropped a photo. (For versions prior to 4.0, this is only required if you have created an adaptation by contributing your own creative material, but it is recommended even when not required.) It is not necessary to note trivial alterations, such as correcting a typo or changing a font size. Finally, you must retain an indication of previous modifications to the work.
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