diff --git a/docs/content/doc/setup/docker-start-to-finish.md b/docs/content/doc/setup/docker-start-to-finish.md
index 2a1253746..a5af2a521 100644
--- a/docs/content/doc/setup/docker-start-to-finish.md
+++ b/docs/content/doc/setup/docker-start-to-finish.md
@@ -90,13 +90,20 @@ server {
 
     location /api/ {
         proxy_pass http://api:3456;
+        client_max_body_size 20M;
     }
 }
 {{< /highlight >}}
 
 This is a simple proxy configuration which will forward all requests to `/api/` to the api container and everything else to the frontend.
 
-**Note:** Even if you want to make your installation available under a different port, you don't need to change anything in this configuration.
+<div class="notification is-info">
+<b>NOTE:</b> Even if you want to make your installation available under a different port, you don't need to change anything in this configuration.
+</div>
+
+<div class="notification is-warning">
+<b>NOTE:</b> If you change the max upload size in Vikunja's settings, you'll need to also change the <code>client_max_body_size</code> in the nginx proxy config.
+</div>
 
 ## Run it
 
diff --git a/docs/content/doc/setup/full-docker-example.md b/docs/content/doc/setup/full-docker-example.md
index d21578d13..3fd114967 100644
--- a/docs/content/doc/setup/full-docker-example.md
+++ b/docs/content/doc/setup/full-docker-example.md
@@ -181,10 +181,15 @@ server {
 
     location /api/ {
         proxy_pass http://api:3456;
+        client_max_body_size 20M;
     }
 }
 {{< /highlight >}}
 
+<div class="notification is-warning">
+<b>NOTE:</b> If you change the max upload size in Vikunja's settings, you'll need to also change the <code>client_max_body_size</code> in the nginx proxy config.
+</div>
+
 `docker-compose.yml` config:
 
 {{< highlight yaml >}}
diff --git a/docs/content/doc/setup/reverse-proxies.md b/docs/content/doc/setup/reverse-proxies.md
index 087017868..3abf4102c 100644
--- a/docs/content/doc/setup/reverse-proxies.md
+++ b/docs/content/doc/setup/reverse-proxies.md
@@ -45,10 +45,15 @@ server {
     
     location /api/ {
         proxy_pass http://localhost:3456;
+        client_max_body_size 20M;
     }
 }
 {{< /highlight >}}
 
+<div class="notification is-warning">
+<b>NOTE:</b> If you change the max upload size in Vikunja's settings, you'll need to also change the <code>client_max_body_size</code> in the nginx proxy config.
+</div>
+
 ### without gzip
 
 {{< highlight conf >}}
@@ -64,10 +69,15 @@ server {
     
     location /api/ {
         proxy_pass http://localhost:3456;
+        client_max_body_size 20M;
     }
 }
 {{< /highlight >}}
 
+<div class="notification is-warning">
+<b>NOTE:</b> If you change the max upload size in Vikunja's settings, you'll need to also change the <code>client_max_body_size</code> in the nginx proxy config.
+</div>
+
 ## Apache
 
 Put the following config in `cat /etc/apache2/sites-available/vikunja.conf`: