diff --git a/03/classes-03.txt b/03/classes-03.txt
index 5560cc2..6b970ae 100644
--- a/03/classes-03.txt
+++ b/03/classes-03.txt
@@ -1,14 +1,34 @@
-#+TITLE: Mathematical packages: amsmath, amsthm, mathtools − capabilities
+English:
 
-* Prezentacja podczas zajęć
- + package amsmath − alignement of equations, multiline indexes,
-   command 'operatorname'
- + package amsthm − ways to define new environments like theorems,
-   command \theoremstyle'
- + package mathtools − command '\smashoperator'; environment
-   matrix-like; command \\DeclarePairedDelimiter'; command
-   'showonlyrefs'
+# + TITLE: Mathematical packages: amsmath, amsthm, mathtools - capabilities
+
+* Presentation during class
+  + package amsmath - alignement of equations, multiline indexes,
+    lệnh 'operatorname'
+  + package amsthm - ways to define new environments like theorems,
+    command \ theoremstyle
+  + package mathtools - command '\ smashoperator'; environment
+    matrix-like; command \\ DeclarePairedDelimiter '; command
+    'Showonlyrefs'
 
 * Exersises
- + Test capabilities of mentioned packages and properly edit the file
-   exrcise-03-plik.tex
+  + Tests capabilities of mentioned packages and properly edit the file
+    exrcise-03-plik.tex
+    
+
+Spanish:
+
+# + TÍTULO: Paquetes matemáticos: amsmath, amsthm, mathtools - capacidades
+
+* Presentación durante la clase
+  + paquete amsmath - alineación de ecuaciones, índices de líneas múltiples,
+    lệnh 'operatorname'
+  + amsthm paquete - formas de definir nuevos entornos como teoremas,
+    comando \ theoremstyle
+  + paquete mathtools - comando '\ smashoperator'; medio ambiente
+    en forma de matriz; comando \\ DeclarePairedDelimiter '; comando
+    '' Showonlyrefs
+
+* Exersises
+  + Comprueba las capacidades de los paquetes mencionados y edita correctamente el archivo
+    exrcise-03-plik.tex
\ No newline at end of file