docs: explicitly state that this is for CI3

readme.rst

@@ -10,6 +10,17 @@ interface and logical structure to access these libraries. CodeIgniter lets
 you creatively focus on your project by minimizing the amount of code needed
 for a given task.
 
+*************
+CodeIgniter 3
+*************
+
+This repository is for the legacy version, CodeIgniter 3.
+`CodeIgniter 4 <https://github.com/codeigniter4/CodeIgniter4>`_ is the latest
+version of the framework.
+
+CodeIgniter 3 is the legacy version of the framework, intended for use with PHP
+5.6+. This version is in maintenance, receiving mostly just security updates.
+
 *******************
 Release Information
 *******************

user_guide_src/source/index.rst

@@ -1,6 +1,6 @@
-######################
-CodeIgniter User Guide
-######################
+########################
+CodeIgniter 3 User Guide
+########################
 
 - :doc:`License Agreement <license>`
 - :doc:`Change Log <changelog>`
@@ -9,6 +9,16 @@ CodeIgniter User Guide
    :local:
    :depth: 2
 
+*************
+CodeIgniter 3
+*************
+
+CodeIgniter 3 is the legacy version of the framework, intended for use with PHP
+5.6+. This version is in maintenance, receiving mostly just security updates.
+
+`CodeIgniter 4 <https://codeigniter.com/user_guide/>`_ is the latest version of
+the framework.
+
 *******
 Welcome
 *******