diff --git a/00.brainstorming-pedagogical-teams/03.presentar_el_proyecto/textbook.es.md b/00.brainstorming-pedagogical-teams/03.presentar_el_proyecto/textbook.es.md
index 71b2ffb23..569c55012 100644
--- a/00.brainstorming-pedagogical-teams/03.presentar_el_proyecto/textbook.es.md
+++ b/00.brainstorming-pedagogical-teams/03.presentar_el_proyecto/textbook.es.md
@@ -215,7 +215,7 @@ https://m3p2.ljbac.com/m3p2/courses/blob/master/00.brainstorming-pedagogical-tea
 https://m3p2.ljbac.com/m3p2/courses/blob/master/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/cheatsheet.fr.md<br>
 Ejemplo de captura de ecuaciones e texto simple, sin orden :<br>
 \- para las sistemas de coordenadas : <br>
-https://m3p2.ljbac.com/m3p2/courses/blob/master/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.fr.md<br>
+https://m3p2.ljbac.com/m3p2/courses/blob/master/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.es.md<br>
 \- para a herramienta vectorial para físicos : <br>
 https://m3p2.ljbac.com/m3p2/courses/blob/master/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md<br>
 \- para el electromagnetismo : <br>