diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/10.vector-analysis/textbook.es.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/10.vector-analysis/textbook.es.md
index a6952ce5c..86d47e776 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/10.vector-analysis/textbook.es.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/10.vector-analysis/textbook.es.md
@@ -37,17 +37,17 @@ example: <!-- this is a comment -->
 
 ---
 
-[ES] Esta es una oportunidad para estandarizar nuestros notación y vocabulario,<br> 
+[ES] Esta es una oportunidad, si lo deseamos, para estandarizar nuestros notación y vocabulario,<br> 
 http://www.electropedia.org/iev/iev.nsf/index?openform&part=102<br>
 o para indicar en el texto la equivalencia con la norma internacional si
 queremos mantener nuestras notaciones y vocabularios. Ejemplo :
 
-[FR] C'est l'occasion de normaliser notre notation et vocabulaire, <br>
+[FR] C'est l'occasion, si nous le souhaitons, de normaliser notre notation et vocabulaire, <br>
 http://www.electropedia.org/iev/iev.nsf/index?openform&part=102<br>
 ou d'indiquer dans le texte l'équivalence avec la norme internationale si
 on souhaite garder nos notations et vocabulaires. Exemple :
 
-[EN] This is an opportunity to standardize our notation and vocabulary, <br>
+[EN] This is an opportunity, if we wish, to standardize our notation and vocabulary, <br>
 http://www.electropedia.org/iev/iev.nsf/index?openform&part=102<br>
 or to indicate in the text the equivalence with the international standard 
 if we wish to keep our notations and terms. Example :