/dev/api: Add an explanation of modhashes to the overview.

r2/r2/lib/validator/validator.py

@@ -762,7 +762,7 @@ class VModhash(Validator):
 
     def param_docs(self):
         return {
-            self.param: 'a modhash',
+            self.param: 'a [modhash](#modhashes)',
         }
 
 class VVotehash(Validator):

r2/r2/public/static/css/reddit.less

@@ -5976,6 +5976,10 @@ body:not(.gold) .allminus-link {
 }
 
 .api-help .contents .overview {
+    h3 {
+        margin-top: 1.5em;
+    }
+
     p {
         margin: .8em 0;
     }

r2/r2/templates/apihelp.html

@@ -132,6 +132,14 @@
   <div class="section overview">
     <h2>overview</h2>
 
+    <h3 id="modhashes">modhashes</h3>
+
+    <p>A modhash is a token that the reddit API requires to help prevent&#32;<a
+      href="http://en.wikipedia.org/wiki/CSRF">CSRF</a>. Modhashes can be
+    obtained via the&#32;<a href="#GET_api_me.json">/api/me.json</a>&#32;call
+    or in the&#32;<code>Listing</code>&#32;structures of several other API
+    calls.</p>
+
     <h3 id="fullnames">fullnames</h3>
 
     <p>A fullname is a combination of a thing's type