diff --git a/internet_collections.md b/internet_collections.md
index 68c9331..055c601 100644
--- a/internet_collections.md
+++ b/internet_collections.md
@@ -68,7 +68,8 @@
 [stack-based virtual machine(6 episode)](https://www.youtube.com/watch?list=PLSiFUSQSRYAOFwfP-aMzXJlWKVyIuWfPU)
     and [register-based(13 episode)](https://youtu.be/cfPDeso3XwI)<br>
 [register virtual machine in rust, with memory visualization](https://youtu.be/_uAMo-bXI5g)<br>
-[tsoding virtual machine for Lisp, in C](https://www.youtube.com/watch?list=PLpM-Dvs8t0VY73ytTCQqgvgCWttV3m8LM)<br>
+[tsoding virtual machine for Lisp, in C](https://www.youtube.com/watch?list=PLpM-Dvs8t0VY73ytTCQqgvgCWttV3m8LM)
+    [some notes](tsoding_bm)<br>
 
 ### Minecraft Redstone Survival
 [Mojang & Minecraft 开始衰落了吗?](https://youtu.be/VKydXD6Lr20)<br>
diff --git a/tsoding_bm.md b/tsoding_bm.md
new file mode 100644
index 0000000..9588c09
--- /dev/null
+++ b/tsoding_bm.md
@@ -0,0 +1,23 @@
+# tsoding vm for lisp
+## [Day 1](https://youtu.be/0irYsCYuZws)
+- 0:15 LLVM?
+- 0:18 вm -- blyat machine
+- 1:?? job
+- 2:10 random access to stack (where my `copy n` came from)
+<!-- 2:18 M-x align-regxp -->
+- 2:20-2:35 fibonacci (where my fib.asm came from)
+- 2:40-2:55 dump in-memory program into/from file (how to implement this in rust?)
+- 4:11 succeed!
+[](https://github.com/tsoding/bm/tree/238612b4f1d300baa922e57a543ed75c153f3e40)
+
+## [Day 2](https://youtu.be/9td67NTtNCg)
+- 2:00 jump lable 
+- 2:11 "or I'll come to your house, steal all your source code, and make all your variables constant, ok. And I'm a haskeller, I know how to make all the variables constant, ok, trust me."
+- about NaN-boxing
+  - https://www.cnblogs.com/qicosmos/p/4285409.html
+  - https://zhuanlan.zhihu.com/p/166406678
+
+## [Day 3](https://youtu.be/LN9vrbBNG64)
+- 0:45 "s64 vs i64, fight"
+- 0:50 [boost integer](https://theboostcpplibraries.com/boost.integer)
+- 0:55 `#include <stdurmom.h>`