<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/osm2pgsql/pull/974#discussion_r346859189">docs/osm2pgsql.1</a>:</p>
<pre style='color:#555'>>  the flat\-nodes mode. This can also increase the speed of applying diff files. This option
 activates the flat\-nodes mode and specifies the location of the database file. It is a
-single large > 16GB file. This mode is only recommended for full planet imports
+single large > 43GB file. This mode is only recommended for full planet imports
</pre>
<p>Can we add some description how this is calculated to avoid updating the docs every few months? Maybe "largest node id * 8 bytes". People adding their own fake node ids with higher offsets to their database also need to be aware of flat file space requirements here.</p>

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