diff --git a/translations/es/README.md b/translations/es/README.md
index ca08d02..129119e 100644
--- a/translations/es/README.md
+++ b/translations/es/README.md
@@ -1090,12 +1090,12 @@ Obtendrá más práctica de grafos en el libro de Skiena (vea Sección de libros
     - [ ] [How to write tests](http://jasonpolites.github.io/tao-of-testing/ch4-1.1.html)
 
 - ### Planificador
-    - in an OS, how it works
-    - can be gleaned from Operating System videos
+    - En un SO, Como funciona
+    - Se pueden obtener de los videos del sistema operativo 
 
 - ### Implementar rutinas del sistema
-    - understand what lies beneath the programming APIs you use
-    - can you implement them?
+    - Entienda lo que hay debajo de las API de programación que usa 
+    - ¿Puede implementarlas?
 
 - ### Búsqueda de cadenas y manipulaciones
     - [ ] [Sedgewick - Suffix Arrays (video)](https://www.youtube.com/watch?v=HKPrVm5FWvg)
@@ -1107,18 +1107,17 @@ Obtendrá más práctica de grafos en el libro de Skiena (vea Sección de libros
         - [ ] [5. Rabin-Karp](https://www.youtube.com/watch?v=QzI0p6zDjK4&index=1&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
     - [ ] [Search pattern in text (video)](https://www.coursera.org/learn/data-structures/lecture/tAfHI/search-pattern-in-text)
 
-    If you need more detail on this subject, see "String Matching" section in [Additional Detail on Some Subjects](#additional-detail-on-some-subjects)
+    Si necesita más detalle de este tema, vea "String Matching" en [Detalles adicionales de ciertos temas](#detalles-adicionales-de-ciertos-temas)
 
 - ### Tries
-    - Note there are different kinds of tries. Some have prefixes, some don't, and some use string instead of bits
-        to track the path.
-    - I read through code, but will not implement.
+    - Note que existen diferentes tipos de tries. Algunos tienen prefijos, otros no, y algunos usan cadenas en lugar de bits para seguir el camino.
+    - Leo a través del código pero no implementaría.
     - [ ] [Sedgewick - Tries (3 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
         - [ ] [1. R Way Tries](https://www.youtube.com/watch?v=buq2bn8x3Vo&index=3&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
         - [ ] [2. Ternary Search Tries](https://www.youtube.com/watch?v=LelV-kkYMIg&index=2&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
         - [ ] [3. Character Based Operations](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ&index=1)
     - [ ] [Notes on Data Structures and Programming Techniques](http://www.cs.yale.edu/homes/aspnes/classes/223/notes.html#Tries)
-    - [ ] Short course videos:
+    - [ ] Videos de cursos cortos:
         - [ ] [Introduction To Tries (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/08Xyf/core-introduction-to-tries)
         - [ ] [Performance Of Tries (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/PvlZW/core-performance-of-tries)
         - [ ] [Implementing A Trie (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/DFvd3/core-implementing-a-trie)