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Robots.txt Extender
v1.0.0 · by bettoadami
Dynamic robots.txt for Multisite! Change parameters, or don't, for each site of your network without losing the defaults from WordPress Includes.
About this plugin
A Multisite Network plugin that removes the automatic sitemap link (deprecated practice) and adds custom parameters/lines at the end of the default Robots.txt whenever called. It will enable small adjustments for each site on the network – like pointing again to specific sitemaps if needed – without sacrificing the default conventions coded to WordPress’ core. To make the adjustments, look for a text area at the end of General Settings Page.