<p><b>@zerebubuth</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2383#discussion_r332957479">INSTALL.md</a>:</p>
<pre style='color:#555'>> @@ -174,20 +174,12 @@ psql -d openstreetmap -c "CREATE EXTENSION btree_gist"
 
 ### PostgreSQL Functions
 
-We need to install special functions into the PostgreSQL databases, and these are provided by a library that needs compiling first.
+There are special database functions required by a (little-used) API call, the migrations and diff replication. The former two are provided as *either* pure SQL functions or a compiled shared library. It is recommended that you start with the pure SQL versions, as described below, and only install the compiled shared library if you are running a production server making a lot of `/changes` API calls or need the diff replication functionality.
</pre>
<p>Good points, thanks. I've made those changes in <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/openstreetmap/openstreetmap-website/commit/2423d869146fa513caf1eb5c6c0a452235f70e05/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/commit/2423d869146fa513caf1eb5c6c0a452235f70e05"><tt>2423d86</tt></a>. Please let me know what you think.</p>

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