diff --git a/docs/linux/introduction.rst b/docs/linux/introduction.rst
new file mode 100644
index 0000000..bd88913
--- /dev/null
+++ b/docs/linux/introduction.rst
@@ -0,0 +1,3 @@
+Introduction to Linux
+=====================
+
diff --git a/docs/postgresql/introduction.rst b/docs/postgresql/introduction.rst
new file mode 100644
index 0000000..b682dc9
--- /dev/null
+++ b/docs/postgresql/introduction.rst
@@ -0,0 +1,3 @@
+Introduction to PostgreSQL
+==========================
+
diff --git a/docs/python/introduction.rst b/docs/python/introduction.rst
new file mode 100644
index 0000000..0c0b0a8
--- /dev/null
+++ b/docs/python/introduction.rst
@@ -0,0 +1,3 @@
+Introduction to Python
+======================
+