diff --git a/innobase/include/mem0mem.h b/innobase/include/mem0mem.h
index 87afdb8f91c..3768e93c03e 100644
--- a/innobase/include/mem0mem.h
+++ b/innobase/include/mem0mem.h
@@ -99,8 +99,7 @@ heap freeing. */
 /*********************************************************************
 NOTE: Use the corresponding macros instead of this function. Creates a
 memory heap which allocates memory from dynamic space. For debugging
-purposes, takes also the file name and line as argument in the debug
-version. */
+purposes, takes also the file name and line as argument. */
 UNIV_INLINE
 mem_heap_t*
 mem_heap_create_func(
diff --git a/innobase/include/mem0mem.ic b/innobase/include/mem0mem.ic
index 8c87c884d78..28562f7c9f8 100644
--- a/innobase/include/mem0mem.ic
+++ b/innobase/include/mem0mem.ic
@@ -371,8 +371,7 @@ mem_heap_free_top(
 /*********************************************************************
 NOTE: Use the corresponding macros instead of this function. Creates a
 memory heap which allocates memory from dynamic space. For debugging
-purposes, takes also the file name and line as argument in the debug
-version. */
+purposes, takes also the file name and line as argument. */
 UNIV_INLINE
 mem_heap_t*
 mem_heap_create_func(
diff --git a/sql/ha_innodb.cc b/sql/ha_innodb.cc
index 290ee1d7883..8abde6980cc 100644
--- a/sql/ha_innodb.cc
+++ b/sql/ha_innodb.cc
@@ -1191,7 +1191,7 @@ Opens an InnoDB database. */
 handlerton*
 innobase_init(void)
 /*===============*/
-			/* out: TRUE if error */
+			/* out: &innobase_hton, or NULL on error */
 {
 	static char	current_dir[3];		/* Set if using current lib */
 	int		err;
@@ -2492,7 +2492,7 @@ Closes a handle to an InnoDB table. */
 int
 ha_innobase::close(void)
 /*====================*/
-				/* out: error number */
+				/* out: 0 */
 {
   	DBUG_ENTER("ha_innobase::close");