diff --git a/Nginx-Webserver-Config.md b/Nginx-Webserver-Config.md
index 1673246..171dd9f 100644
--- a/Nginx-Webserver-Config.md
+++ b/Nginx-Webserver-Config.md
@@ -14,8 +14,37 @@ Once I deleted those files, nginx was working instantly. Propose a new step coul
 
 If you use Nginx in front of Wekan on CentOS 7, please try: `setsebool -P httpd_can_network_connect 1`. This should allow nginx or any other webserver to connect to a container. Please [**do not disable SELinux**](https://github.com/wekan/wekan/issues/2792#issuecomment-630222315) 
 
+## Nginx requires unsafe-eval for WeKan date format
 
-## [Attachment file size](https://github.com/wekan/wekan/issues/2103#issuecomment-455014303)
+[Source](https://github.com/wekan/wekan/issues/4220#issuecomment-990243775)
+
+Thank you for your answers. I figured out that in my nginx config I needed to add allow `unsafe-eval`:
+
+Old:
+```
+add_header Content-Security-Policy "default-src 'self' 'unsafe-inline'";
+```
+Now:
+```
+add_header Content-Security-Policy "default-src 'self' 'unsafe-inline' 'unsafe-eval'";
+```
+This solves my problem.
+
+Thanks
+
+## Attachment file size
+
+[Source](https://github.com/wekan/wekan/issues/2103#issuecomment-455014303)
+
+`/etc/nginx.conf`:
+```
+http {
+    ...
+    client_max_body_size 100M;
+}    
+```
+
+## Others
 
 [Meteor.js on Ubuntu 14.04 with nginx](https://www.digitalocean.com/community/tutorials/how-to-deploy-a-meteor-js-application-on-ubuntu-14-04-with-nginx)