diff --git a/nats_server/configuration.md b/nats_server/configuration.md
index bb273d8..79c3818 100644
--- a/nats_server/configuration.md
+++ b/nats_server/configuration.md
@@ -115,6 +115,7 @@ authorization: {
 | `max_payload` | Maximum number of bytes in a message payload |
 | `max_subscriptions` | Maximum numbers of subscriptions for a client connection |
 | [`operator`](/nats_tools/nsc/nsc.md#nats-server-configuration) | path to an operator JWT |
+| [`ping_interval`](developer/connecting/pingpong.md) | Interval in seconds in which the server checks if a connection is active |
 | `port` | port for client connections |
 | [`resolver`](/nats_tools/nsc/nsc.md#nats-server-configuration)  | Resolver type `MEMORY` or `URL` for account JWTs |
 | [`tls`](tls.md#tls-configuration) | configuration map for tls for client and http monitoring |
@@ -128,4 +129,4 @@ A server can reload most configuration changes without requiring a server restar
 
 ```
 > nats-server --signal reload
-```
\ No newline at end of file
+```