diff --git a/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md b/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md
index 3e0d306eb..00f55fc0e 100644
--- a/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md
+++ b/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md
@@ -295,7 +295,7 @@ $`\quad=g_{xx}\,dx^2+1+g_{yy}\,dy^2+(g_{xy}+g_{yx})\,dxdy`$
 
 --->
 
-### 3 - Espace récirpoque et base duale.
+### 3 - Espace réciproque et base duale.