diff --git a/.hash b/.hash
index 4f353eb..a5ad6ea 100644
--- a/.hash
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@@ -1,4 +1,5 @@
 ainotes.cls,4b2f613
+cognition-and-neuroscience,409ab70
 fundamentals-of-ai-and-kr/module1,1677e27
 fundamentals-of-ai-and-kr/module2,9622aab
 fundamentals-of-ai-and-kr/module3,f38189a
diff --git a/cognition-and-neuroscience/cn.pdf b/cognition-and-neuroscience/cn.pdf
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index 0000000..1513f05
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