diff --git a/contrib/amcheck/verify_nbtree.c b/contrib/amcheck/verify_nbtree.c
index eb280d4893..6979aff727 100644
--- a/contrib/amcheck/verify_nbtree.c
+++ b/contrib/amcheck/verify_nbtree.c
@@ -104,7 +104,7 @@ typedef struct BtreeCheckState
 
 	/*
 	 * The rightlink and incomplete split flag of block one level down to the
-	 * target page, which was visited last time via downlink from taget page.
+	 * target page, which was visited last time via downlink from target page.
 	 * We use it to check for missing downlinks.
 	 */
 	BlockNumber prevrightlink;
diff --git a/src/backend/access/transam/xlogreader.c b/src/backend/access/transam/xlogreader.c
index 133b09dd69..631f260f79 100644
--- a/src/backend/access/transam/xlogreader.c
+++ b/src/backend/access/transam/xlogreader.c
@@ -1476,7 +1476,7 @@ err:
 }
 
 /*
- * Helper function to ease writing of XLogRoutine->page_read callbacks.
+ * Helper function to ease writing of XLogReaderRoutine->page_read callbacks.
  * If this function is used, caller must supply a segment_open callback in
  * 'state', as that is used here.
  *
diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index 889e20b5dd..c263a59690 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -804,7 +804,7 @@ standby_priority_comparator(const void *a, const void *b)
 
 	/*
 	 * We might have equal priority values; arbitrarily break ties by position
-	 * in the WALSnd array.  (This is utterly bogus, since that is arrival
+	 * in the WalSnd array.  (This is utterly bogus, since that is arrival
 	 * order dependent, but there are regression tests that rely on it.)
 	 */
 	return sa->walsnd_index - sb->walsnd_index;