diff --git a/content/notes/03-sequential-logic-circuits.md b/content/notes/03-sequential-logic-circuits.md
index eba5c77e0..5033507b8 100644
--- a/content/notes/03-sequential-logic-circuits.md
+++ b/content/notes/03-sequential-logic-circuits.md
@@ -12,4 +12,19 @@ Sequential logic circuit output depends not only on the inputs but also past his
 ![combinatorial vs sequential](https://i.imgur.com/GbfAZ4c.png)
 
 
+Two types:
+- synchronous
+	- changes of state happen in time with a clock cycle
+	- input changes occur between clock pulses
+	- state changes occur at the clock pulses
+- asynchronous
+	- We will not be studying these
+	- State changes occur as changes in inputs occur
+	- Event driven
 
+
+# Memory circuits
+- Set-reset latch
+- D-type flip-flop
+- T-type flip-flop
+- JK-type flip-flop
\ No newline at end of file