In the article “Maternal Hypothyroxinemia Impairs Spatial Learning and Synaptic Nature and Function in the Offspring” by M. C. Opazo, A. Gianini, F. Pancetti, G. Azkcona, L. Alarcón, R. Lizana, V. Noches, P. A. Gonzalez, M. Porto, S. Mora, D. Rosenthal, E. Eugenin, D. Naranjo, S. M. Bueno, A. M. Kalergis, and C. A. Riedel (Endocrinology 149:5097–5106, 2008), one of the authors names was submitted incorrectly. M. Porto should be M. P. Marassi. The authors apologize for their error.