diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.es.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.es.md
index 887ebc940..7b21fbe58 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.es.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.es.md
@@ -6,6 +6,8 @@ visible: false
 lessons:
     - slug: define-g12-mathematical-tools
       order: 1
+    - slug: define-g12-mathematical-tools-p1
+      order: 1
 ---
 
 #### Definir las herramientas matemáticas necesarias en cada nivel