diff --git a/pages/Sigman___Dos marchando juntos.md b/pages/Sigman___Dos marchando juntos.md
index 76887cd..cb780d4 100644
--- a/pages/Sigman___Dos marchando juntos.md	
+++ b/pages/Sigman___Dos marchando juntos.md	
@@ -73,6 +73,7 @@
 		  logseq.order-list-type:: number
 		- Miller, S. E., Reavis, R. E., & Avila, B. N. (2018). *Associations between theory of mind, executive function, and friendship quality in middle childhood*. Merrill-Palmer Quarterly, 64(3), 397-426
 		  logseq.order-list-type:: number
+	- ## Capítulo 4. Los límites de la amistad
 		- Piff, P. K., Wiwad, D., Robinson, A. R., Aknin, L. B., Mercier, B., & Shariff, A. (2020). *Shifting attributions for poverty motivates opposition to inequality and enhances egalitarianism*. Nature Human Behaviour, 4(5), 496-505.
 		  logseq.order-list-type:: number
 		- Frith, C., & Frith, U. (2005). *Theory of mind*. Current biology, 15(17), R644-R645.