--- ./old/postgres/src/interfaces/libpq/libpq-int.h	2018-07-19 19:18:19.028995039 +0300
+++ ./new/postgres/src/interfaces/libpq/libpq-int.h	2018-07-20 11:30:24.540155942 +0300
@@ -349,6 +349,11 @@
 										 * retransmits */
 	char	   *keepalives_count;	/* maximum number of TCP keepalive
 									 * retransmits */
+	char	   *keepalives_user_timeout;		 /*
+								 * maximum amount of time in milliseconds that transmitted
+								 * data may remain unacknowledged before TCP will forcibly
+								 * close the corresponding connection
+								 */
 	char	   *scram_channel_binding;	/* SCRAM channel binding type */
 	char	   *sslmode;		/* SSL mode (require,prefer,allow,disable) */
 	char	   *sslcompression; /* SSL compression (0 or 1) */