Pages on the Scratch Wiki are often cached, which means that the page isn't the most recent version of the page. One may wish to purge an article to clear the page server's cache. This is especially useful for pages that have transclusions, as transcluded content sometimes don't update instantly.
It is recommended that a hard refresh is carried out first, especially after uploading an image. Go to the sidebar on the left and find the link "Purge cache" at the bottom of the For Editors section. Click it and confirm the purge. You have now purged the page.