Every time a user clicks Save on a wiki page, a new version of the wiki is saved to the OSF. You can view and compare versions of a wiki page to see what has changed over time.
First, open your project. Then click the Wiki button in the navigation bar or in the "Wiki" section.
You will be taken to your wiki.
Open a wiki page.
Then click the Compare button in the top right of the page.
The "View" and "Compare" panes will appear with their version history.
Use the drop-down menus in the "View" and "Compare" panes to select the versions of the wiki that you want to compare.