diff --git a/.hash b/.hash
index de582c0..ab5aaf1 100644
--- a/.hash
+++ b/.hash
@@ -1,6 +1,7 @@
 ainotes.cls,d9b2afb
 cognition-and-neuroscience,f619bee
 combinatorial-decision-making-and-optimization/module1,400dfd1
+combinatorial-decision-making-and-optimization/module2,1cd91f0
 deep-learning,2582b90
 fundamentals-of-ai-and-kr/module1,400dfd1
 fundamentals-of-ai-and-kr/module2,400dfd1
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new file mode 100644
index 0000000..c1c96df
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