diff --git a/doc/guides/kconfig/index.rst b/doc/guides/kconfig/index.rst
index d1cac66dff2..66257e68f07 100644
--- a/doc/guides/kconfig/index.rst
+++ b/doc/guides/kconfig/index.rst
@@ -3,6 +3,24 @@
 Kconfig
 #######
 
+The Zephyr kernel and subsystems can be configured at build time to adapt them
+for specific application and platform needs. Configuration is handled through
+Kconfig, which is the same configuration system used by the Linux kernel. The
+goal is to support configuration without having to change any source code.
+
+Configuration options (often called *symbols*) are defined in :file:`Kconfig`
+files, which also specify dependencies between symbols that determine what
+configurations are valid. Symbols can be grouped into menus and sub-menus to
+keep the interactive configuration interfaces organized.
+
+The output from Kconfig is a header file :file:`autoconf.h` with macros that
+can be tested at build time. Code for unused features can be compiled out to
+save space.
+
+The following sections explain how to set Kconfig configuration options, go
+into detail on how Kconfig is used within the Zephyr project, and have some
+tips and best practices for writing :file:`Kconfig` files.
+
 .. toctree::
    :maxdepth: 1