diff --git a/doc/README.xnet b/doc/README.xnet
new file mode 100644
index 0000000000..3fe09133a0
--- /dev/null
+++ b/doc/README.xnet
@@ -0,0 +1 @@
+TODO by Dmitry Yemanov
diff --git a/doc/sql.extensions/README.expression_indices b/doc/sql.extensions/README.expression_indices
new file mode 100644
index 0000000000..3fe09133a0
--- /dev/null
+++ b/doc/sql.extensions/README.expression_indices
@@ -0,0 +1 @@
+TODO by Dmitry Yemanov
diff --git a/doc/sql.extensions/README.null_value b/doc/sql.extensions/README.null_value
new file mode 100644
index 0000000000..3fe09133a0
--- /dev/null
+++ b/doc/sql.extensions/README.null_value
@@ -0,0 +1 @@
+TODO by Dmitry Yemanov
diff --git a/doc/sql.extensions/README.rows b/doc/sql.extensions/README.rows
new file mode 100644
index 0000000000..3fe09133a0
--- /dev/null
+++ b/doc/sql.extensions/README.rows
@@ -0,0 +1 @@
+TODO by Dmitry Yemanov
diff --git a/doc/sql.extensions/README.select_expressions b/doc/sql.extensions/README.select_expressions
new file mode 100644
index 0000000000..3fe09133a0
--- /dev/null
+++ b/doc/sql.extensions/README.select_expressions
@@ -0,0 +1 @@
+TODO by Dmitry Yemanov
diff --git a/doc/sql.extensions/README.view_updates b/doc/sql.extensions/README.view_updates
new file mode 100644
index 0000000000..3fe09133a0
--- /dev/null
+++ b/doc/sql.extensions/README.view_updates
@@ -0,0 +1 @@
+TODO by Dmitry Yemanov