diff --git a/docs/u_e-watchdog-thresholds.md b/docs/u_e-watchdog-thresholds.md
new file mode 100644
index 000000000..5d240ab4a
--- /dev/null
+++ b/docs/u_e-watchdog-thresholds.md
@@ -0,0 +1,35 @@
+Watchdog uses default values for all thresholds defined in `docker-compose.yml`.
+
+The default values will work for most setups.
+
+Example:
+
+```
+       - NGINX_THRESHOLD=${NGINX_THRESHOLD:-5}
+        - UNBOUND_THRESHOLD=${UNBOUND_THRESHOLD:-5}
+        - REDIS_THRESHOLD=${REDIS_THRESHOLD:-5}
+        - MYSQL_THRESHOLD=${MYSQL_THRESHOLD:-5}
+        - MYSQL_REPLICATION_THRESHOLD=${MYSQL_REPLICATION_THRESHOLD:-1}
+        - SOGO_THRESHOLD=${SOGO_THRESHOLD:-3}
+        - POSTFIX_THRESHOLD=${POSTFIX_THRESHOLD:-8}
+        - CLAMD_THRESHOLD=${CLAMD_THRESHOLD:-15}
+        - DOVECOT_THRESHOLD=${DOVECOT_THRESHOLD:-12}
+        - DOVECOT_REPL_THRESHOLD=${DOVECOT_REPL_THRESHOLD:-20}
+        - PHPFPM_THRESHOLD=${PHPFPM_THRESHOLD:-5}
+        - RATELIMIT_THRESHOLD=${RATELIMIT_THRESHOLD:-1}
+        - FAIL2BAN_THRESHOLD=${FAIL2BAN_THRESHOLD:-1}
+        - ACME_THRESHOLD=${ACME_THRESHOLD:-1}
+        - RSPAMD_THRESHOLD=${RSPAMD_THRESHOLD:-5}
+        - OLEFY_THRESHOLD=${OLEFY_THRESHOLD:-5}
+        - MAILQ_THRESHOLD=${MAILQ_THRESHOLD:-20}
+        - MAILQ_CRIT=${MAILQ_CRIT:-30}
+```
+
+
+To adjust them just add necessary threshold variables (e.g. `MAILQ_THRESHOLD=10`) to `mailcow.conf` and run `docker-compose up -d`.
+
+## Thresholds description
+
+### MAILQ_CRIT and MAILQ_THRESHOLD
+
+Notificaty administrators if number of emails in the postfix queue is greater then `MAILQ_CRIT` for periond of `MAILQ_THRESHOLD * (60±30)` seconds.
diff --git a/mkdocs.yml b/mkdocs.yml
index 9b23c154b..be490673a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -108,6 +108,8 @@ nav:
     - 'Nginx':
       - 'Create subdomain webmail.example.org': 'u_e-webmail-site.md'
       - 'Custom sites': 'u_e-nginx.md'
+    - 'Watchdog':
+      - 'Thresholds': 'u_e-watchdog-thresholds.md'
     - 'Redis': 'u_e-redis.md'
     - 'Rspamd': 'u_e-rspamd.md'
     - 'SOGo': 'u_e-sogo.md'