diff --git a/src/backend/postmaster/walsummarizer.c b/src/backend/postmaster/walsummarizer.c
index aeee22388e7..b7846ecd756 100644
--- a/src/backend/postmaster/walsummarizer.c
+++ b/src/backend/postmaster/walsummarizer.c
@@ -250,7 +250,7 @@ WalSummarizerMain(const void *startup_data, size_t startup_data_len)
 	AuxiliaryProcessMainCommon();
 
 	ereport(DEBUG1,
-			(errmsg_internal("WAL summarizer started")));
+			(errmsg_internal("modified WAL summarizer started")));
 
 	/*
 	 * Properly accept or ignore signals the postmaster might send us
@@ -1600,6 +1600,9 @@ summarizer_wal_segment_open(XLogReaderState *state, XLogSegNo nextSegNo,
 	TimeLineID	tli = *tli_p;
 	char		path[MAXPGPATH];
 
+	/* Debugging output. */
+	elog(LOG, "inside summarizer_wal_segment_open");
+
 	for (;;)
 	{
 		XLogFilePath(path, tli, nextSegNo, state->segcxt.ws_segsize);