diff --git a/docs/man/pantalaimon.5 b/docs/man/pantalaimon.5
index 01fd2d1..6c00f64 100644
--- a/docs/man/pantalaimon.5
+++ b/docs/man/pantalaimon.5
@@ -56,6 +56,8 @@ This option configures if a proxy instance should only keep the latest version
 of a room key from a certain user around. This effectively means that only newly
 incoming messages will be decryptable, the proxy will be unable to decrypt the
 room history.  Defaults to "No".
+.It Cm ClientMaxSize
+The maximum size of a request, in bytes. Defaults to "104857600".
 .It Cm SearchRequests
 This option configures if the proxy should make additional HTTP requests to the
 server when clients use the search API endpoint. Some data that is required to
diff --git a/docs/man/pantalaimon.5.md b/docs/man/pantalaimon.5.md
index 60be6f8..ed2696a 100644
--- a/docs/man/pantalaimon.5.md
+++ b/docs/man/pantalaimon.5.md
@@ -69,6 +69,10 @@ The following keys are optional in the proxy instance sections:
 > incoming messages will be decryptable, the proxy will be unable to decrypt the
 > room history.  Defaults to "No".
 
+**ClientMaxSize**
+
+> The maximum size of a request, in bytes. Defaults to "104857600".
+
 Additional to the homeserver section a special section with the name
 **Default**
 can be used to configure the following values for all homeservers: