diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
index 7ea014841..e18949f0e 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
@@ -672,6 +672,21 @@ $`\displaystyle\dfrac{d\left(\overrightarrow{OM}\right)(t)}{dt}
 \right)`$
 
 
+##### Propongo el siguiente escrito (a discutir) / Je propose l'écriture suivante (à débattre) / I propose the following writing (to be discussed)
+
+En la escritura de una ecuación, vemos con relativa frecuencia vemos el error de tipo :<br>
+Dans l'écriture d'une équation, nous voyons relativement souvent l'erreur de type :<br>
+In the expression of an equation, we relatively often see the type of error :
+
+$`d ... = \int ... d...`$
+
+En una parte del curso "Atención" (fondo rojo), tendremos que explicar esto.<br>
+Dans une partie de cours "Attention" (fond rouge), nous devrons expliquer cela.<br>
+In a part of the course "Attention" (red background), we will have to explain this.
+
+
+
+
 $`\displaystyle\dfrac{d\left(\overrightarrow{OM}\right)(t)}{dt}
 =\lim_{\Delta t\rightarrow 0}
 \left(