diff --git a/README.md b/README.md
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+++ b/README.md
@@ -6,5 +6,6 @@
 | :---:      | :---  | 
 | 05.09.2023 | [Вводная лекция](lectures/IIS_lec_1.pdf) [pptx](lectures/IIS_lec_1.pptx) |
 | 13.09.2023 | [Файловая система HDFS](lectures/IIS_lec_2.pdf) [pptx](lectures/IIS_lec_2.pptx) |  
+| 19.09.2023 | [MapReduce](lectures/IIS_lec_3.pdf) [pptx](lectures/IIS_lec_3.pptx) |  
 
 ## Лабораторные работы
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