Add the wiki link to the store description + the mod <url>

About/About.xml

@@ -3,6 +3,7 @@
   <packageId>flan.institution</packageId>
   <name>Institution</name>
   <author>flan</author>
+  <url>https://git.onetick.ninja/flan/institution/wiki</url>
   <supportedVersions>
     <li>1.6</li>
   </supportedVersions>
@@ -24,6 +25,9 @@ Turn any layer off in Options -> Mod Settings and it goes inert immediately. The
 
 Requires Harmony. Pairs with the standalone Foul Play (the vessel/substance framework), which bridges in when both are present.
 
+FULL GUIDE, per-layer detail, and a "what do I do when..." scenario FAQ -- the wiki:
+https://git.onetick.ninja/flan/institution/wiki
+
 Part of the Institution suite.
   </description>
   <modDependencies>