**Partial Builds:** Prior to this release Hugo would always reread and rebuild
the entire site. This release introduces support for reactive site building
-while watching (`hugo serve`). Hugo will watch the filesystem for changes and
+while watching (`hugo server`). Hugo will watch the filesystem for changes and
only re-read the changed files. Depending on the files change Hugo will
intelligently re-render only the needed portion of the site. Performance gains
depend on the operation performed and size of the site. In our testing build