diff --git a/doc/src/sgml/generic-wal.sgml b/doc/src/sgml/generic-wal.sgml
index a00c03c..d756e33 100644
--- a/doc/src/sgml/generic-wal.sgml
+++ b/doc/src/sgml/generic-wal.sgml
@@ -4,15 +4,15 @@
  <title>Generic WAL records</title>

   <para>
-   Despite all built in access methods and WAL-logged modules have their own
-   types of WAL records, there is also generic WAL record type which describes
+   Despite all built-in access methods and WAL-logged modules having their own
+   types of WAL records, there is also a generic WAL record type, which describes
    changes to pages in a generic way.  This is useful for extensions that
    provide custom access methods, because they cannot register their own
    WAL redo routines.
   </para>

   <para>
-   API for contructing generic WAL records is defined in
+   The API for contructing generic WAL records is defined in
    <filename>generic_xlog.h</> and implemented in <filename>generic_xlog.c</>.
    Each generic WAL record must be constructed by following these steps:

diff --git a/src/backend/access/transam/generic_xlog.c b/src/backend/access/transam/generic_xlog.c
index 32c2648..1a720fa 100644
--- a/src/backend/access/transam/generic_xlog.c
+++ b/src/backend/access/transam/generic_xlog.c
@@ -19,7 +19,7 @@
 #include "utils/memutils.h"

 /*-------------------------------------------------------------------------
- * Internally, a delta between pages consists of set of fragments.  Each
+ * Internally, a delta between pages consists of a set of fragments.  Each
  * fragment represents changes made in a given region of a page.  A fragment
  * is made up as follows:
  *
@@ -29,7 +29,7 @@
  *
  * Unchanged regions of a page are not represented in its delta.  As a
  * result, a delta can be more compact than the full page image.  But having
- * an unchanged region in the middle to two fragments that is smaller than
+ * an unchanged region in the middle of two fragments that is smaller than
  * the fragment header (offset and length) does not pay off in terms of the
  * overall size of the delta. For this reason, we break fragments only if
  * the unchanged region is bigger than MATCH_THRESHOLD.
@@ -422,7 +422,7 @@ generic_redo(XLogReaderState *record)

 	Assert(record->max_block_id < MAX_GENERIC_XLOG_PAGES);

-	/* Interate over blocks */
+	/* Iterate over blocks */
 	for (block_id = 0; block_id <= record->max_block_id; block_id++)
 	{
 		XLogRedoAction action;