diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index e64b7ef..458ae0f 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -642,6 +642,11 @@ postgres   27093  0.0  0.0  30096  2752 ?        Ss   11:34   0:00 postgres: ser
          </listitem>
          <listitem>
           <para>
+           <literal>waiting for synchronous replication</>: The backend is waiting for its transaction to be flushed on a synchronous standby.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
            <literal>idle</>: The backend is waiting for a new client command.
           </para>
          </listitem>
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index 325239d..b6ee1c3 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -45,7 +45,7 @@
 #include "postgres.h"
 
 #include <unistd.h>
-
+#include <pgstat.h>
 #include "access/xact.h"
 #include "miscadmin.h"
 #include "replication/syncrep.h"
@@ -151,6 +151,16 @@ SyncRepWaitForLSN(XLogRecPtr XactCommitLSN)
 		set_ps_display(new_status, false);
 		new_status[len] = '\0'; /* truncate off " waiting ..." */
 	}
+	/*
+	 * Alter state in pg_stat before entering the loop.
+	 * As with updating the ps display it is save to assume that we'll wait
+	 * at least for a short time. Hence updating to a waiting state seems
+	 * appropriate even without exactly checking if waiting is required.
+	 * However, we avoid using the waiting-flag at this point as there is
+	 * no lock to wait for.
+	 */
+
+	pgstat_report_activity(STATE_WAITINGFORREPLICATION,NULL);
 
 	/*
 	 * Wait for specified LSN to be confirmed.
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index f7c9bf6..84d67e0 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -663,6 +663,9 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
 				case STATE_IDLEINTRANSACTION_ABORTED:
 					values[4] = CStringGetTextDatum("idle in transaction (aborted)");
 					break;
+				case STATE_WAITINGFORREPLICATION:
+					values[4] = CStringGetTextDatum("waiting for synchronous replication");
+					break;
 				case STATE_DISABLED:
 					values[4] = CStringGetTextDatum("disabled");
 					break;
diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index 9ecc163..ab1befc 100644
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -692,6 +692,7 @@ typedef enum BackendState
 	STATE_IDLEINTRANSACTION,
 	STATE_FASTPATH,
 	STATE_IDLEINTRANSACTION_ABORTED,
+	STATE_WAITINGFORREPLICATION,
 	STATE_DISABLED
 } BackendState;