diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/03.geometries-space-time/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/03.geometries-space-time/textbook.fr.md
index f1009ae9d..c7afd5e6b 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/03.geometries-space-time/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/03.geometries-space-time/textbook.fr.md
@@ -18,6 +18,13 @@ $`\Longrightarrow`$  mecánicas lagrangiana y hamiltoniana /
 mécaniques lagrangienne et hamiltonienne / Lagrangian and Hamiltonian mechanics
 
 
+* [ES] Espacio de dimensión 6, un punto esta identificado por sus 3 coordenadas espaciales
+y los 3 componentes de su momento.<br>
+[FR] Espace de dimension 6, un point étant repéré par ses 3 coordonnées spatiales et 
+les 3 composantes de son impulsion..<br>
+[EN] Space of dimension 6, a point being identified by its three spatial coordinates
+and the three components of its momentum.
+