diff --git a/notes.md b/notes.md
index dfc620e..9a4af8b 100644
--- a/notes.md
+++ b/notes.md
@@ -28,3 +28,8 @@ development board.
 - [X] Remove doxygen stuff from toolchain file.
 - [ ] Check through debuging flags in toolchain file.
 
+## Questions
+
+- [ ] What is semi-hosting in stm32 context.
+- [ ] What are mthumb or thumb?
+- [ ]