diff --git a/src/components/map/Handlers.tsx b/src/components/map/Handlers.tsx
index 76c725d..8a84441 100644
--- a/src/components/map/Handlers.tsx
+++ b/src/components/map/Handlers.tsx
@@ -1,11 +1,16 @@
-import react, { useRef, useState } from 'react';
-import { atom, useAtom } from 'jotai';
+import react, { useRef } from 'react';
+import { useAtom } from 'jotai';
 
 import { Point } from './types';
 import './Handler.css';
 import { handlersConfig } from './config';
-import { Transformation, relativeCoordinateSystemAtom } from './Map';
+import { relativeCoordinateSystemAtom } from './Map';
 
+/**
+ * 
+ * See also {@link components/map/Map!relativeCoordinateSystemAtom}.
+ * 
+ */
 export interface HandlersProperties {}
 /**
  *
@@ -18,6 +23,7 @@ export interface HandlersProperties {}
  * * touchStart, touchEnd and touchCancel to track touch state
  * * touchMove to shift the map (single finger) or shift and zoom (two fingers).
  *
+ * Communication with the parent `<Map>` is done through {@link components/map/Map!relativeCoordinateSystemAtom}.
  */
 export const Handlers: react.FC<HandlersProperties> = (
   props: HandlersProperties
diff --git a/src/components/map/Map.tsx b/src/components/map/Map.tsx
index 4951dff..52e3c1e 100644
--- a/src/components/map/Map.tsx
+++ b/src/components/map/Map.tsx
@@ -15,12 +15,21 @@ const initialCoordinateSystem = {
 
 const coordinateSystemAtom = atom(initialCoordinateSystem);
 
+/**
+ * Description of coordinates system transformation
+ */
 export interface Transformation {
+  /** New translation to apply */
   deltaShift: Point | null;
+  /** Zoom factor to apply */
   deltaZoom: number | null;
+  /** Center of the new zoom to apply */
   zoomCenter: Point | null;
 }
 
+/**
+ * A write only atom to translate and zoom the coordinate system
+ */
 export const relativeCoordinateSystemAtom = atom(
   null,
   (get, set, t: Transformation) => {