diff --git a/cst337/lec/lec11.md b/cst337/lec/lec11.md
new file mode 100644
index 0000000..4f526f5
--- /dev/null
+++ b/cst337/lec/lec11.md
@@ -0,0 +1,3 @@
+# lec11
+
+
diff --git a/cst337/lec/lec9.md b/cst337/lec/lec9.md
index cad2879..ab9fcf4 100644
--- a/cst337/lec/lec9.md
+++ b/cst337/lec/lec9.md
@@ -82,19 +82,21 @@ For now we'll take two inputs and get 1 output, with a carry-output.
 
 Let's add 2 bits
 
-|a|b|out|
-|0|0|0|
-|0|1|1|
-|1|0|1|
-|1|1|0|
+|a  |b  |out|
+|---|---|---|
+|0  |0  |0  |
+|0  |1  |1  |
+|1  |0  |1  |
+|1  |1  |0  |
 
 What about the carry bit however? What would _it_ look like given the preivous operations?
 
-|a|b	|carryout|
-|0|0	|0|
-|0|1	|0|
-|1|0	|0|
-|1|1	|1|
+|a  |b	|carryout|
+|---|---|---|
+|0  |0	|0  |
+|0  |1	|0  |
+|1  |0	|0  |
+|1  |1	|1  |
 
 Before what this implies note that the result of the carryout resembles
 
@@ -105,6 +107,7 @@ Two inputs, One output, One carry-out, One carry-in
 Here we'll add up `a & b`(inputs) and `c` carry-in
 
 |c|a|b		|output|
+|---|---|---|---|
 |0|0|0		|0|
 |0|0|1		|1|
 |0|1|0		|1|