1 files changed, 4 insertions, 0 deletions
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 7b97f73a29..f8925a5e24 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -954,6 +954,10 @@ media_store_path: "DATADIR/media_store"
 
 # The largest allowed upload size in bytes
 #
+# If you are using a reverse proxy you may also need to set this value in
+# your reverse proxy's config. Notably Nginx has a small max body size by default.
+# See https://matrix-org.github.io/synapse/develop/reverse_proxy.html.
+#
 #max_upload_size: 50M
 
 # Maximum number of pixels that will be thumbnailed