diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index 0b1725816e..97fd1beb39 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -25,8 +25,10 @@ messages from the database after 5 minutes, rather than 5 months.
In addition, configuration options referring to size use the following suffixes:
-* `M` = MiB, or 1,048,576 bytes
* `K` = KiB, or 1024 bytes
+* `M` = MiB, or 1,048,576 bytes
+* `G` = GiB, or 1,073,741,824 bytes
+* `T` = TiB, or 1,099,511,627,776 bytes
For example, setting `max_avatar_size: 10M` means that Synapse will not accept files larger than 10,485,760 bytes
for a user avatar.
|
