diff --git a/ChangeLog b/ChangeLog
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@@ -1,3 +1,7 @@
+2025-02-04  Mert Gör  <mertgor@masscollabs.xyz>
+
+	* c-basic/CSD-C-Basic-Book/C.pdf: 30. page sqrt example solved
+
 2025-01-10  Mert Gör  <mertgor@masscollabs.xyz>
 
 	* c-basic/hello.c: hello world on GNU/Linux