diff --git a/src/base/README.md b/src/base/README.md
new file mode 100644
index 0000000..4d7c7a3
--- /dev/null
+++ b/src/base/README.md
@@ -0,0 +1,19 @@
+# Base
+
+The **base** folder contains the stylistic foundations of the graphic charter. It includes definitions of the _colors_ and _fonts_ used consistently in interface design.
+This folder is made up of two subfolders:
+- colors
+- fonts
+
+## Colors
+
+This subfolder contains the `SCSS` files defining the project's color palettes. Each file represents a specific color from the graphic charter.
+
+## Fonts
+
+This subfolder contains the project's typographic definitions, in accordance with the graphic charter. It also includes a folder dedicated to the Spectral font, with SCSS files defining :
+
+- the font family
+- sizes
+- line heights
+- weights