diff --git a/src/bin/pg_combinebackup/pg_combinebackup.c b/src/bin/pg_combinebackup/pg_combinebackup.c
index 4f8ba156336..69e5fd31a73 100644
--- a/src/bin/pg_combinebackup/pg_combinebackup.c
+++ b/src/bin/pg_combinebackup/pg_combinebackup.c
@@ -814,7 +814,7 @@ parse_oid(char *s, Oid *result)
  * Copy files from the input directory to the output directory, reconstructing
  * full files from incremental files as required.
  *
- * If processing is a user-defined tablespace, the tsoid should be the OID
+ * If processing a user-defined tablespace, the tsoid should be the OID
  * of that tablespace and input_directory and output_directory should be the
  * toplevel input and output directories for that tablespace. Otherwise,
  * tsoid should be InvalidOid and input_directory and output_directory should
@@ -826,7 +826,7 @@ parse_oid(char *s, Oid *result)
  *
  * n_prior_backups is the number of prior backups that we have available.
  * This doesn't count the very last backup, which is referenced by
- * output_directory, just the older ones. prior_backup_dirs is an array of
+ * input_directory, just the older ones. prior_backup_dirs is an array of
  * the locations of those previous backups.
  */
 static void