diff --git a/develop/usage/configuration/config_documentation.html b/develop/usage/configuration/config_documentation.html
index 414593c55e..319e0d868b 100644
--- a/develop/usage/configuration/config_documentation.html
+++ b/develop/usage/configuration/config_documentation.html
@@ -169,8 +169,10 @@ followed by a letter. Letters have the following meanings:</p>
messages from the database after 5 minutes, rather than 5 months.</p>
<p>In addition, configuration options referring to size use the following suffixes:</p>
<ul>
-<li><code>M</code> = MiB, or 1,048,576 bytes</li>
<li><code>K</code> = KiB, or 1024 bytes</li>
+<li><code>M</code> = MiB, or 1,048,576 bytes</li>
+<li><code>G</code> = GiB, or 1,073,741,824 bytes</li>
+<li><code>T</code> = TiB, or 1,099,511,627,776 bytes</li>
</ul>
<p>For example, setting <code>max_avatar_size: 10M</code> means that Synapse will not accept files larger than 10,485,760 bytes
for a user avatar.</p>
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