diff --git a/Hardware/Logic_Gates/Logic_gates.md b/Hardware/Logic_Gates/Logic_gates.md
index f1497f3..e69456e 100644
--- a/Hardware/Logic_Gates/Logic_gates.md
+++ b/Hardware/Logic_Gates/Logic_gates.md
@@ -9,3 +9,9 @@ tags:
 # Logic gates
 
 Logic gates are the basic building blocks of digital computing. **A logic gate is an electrical circuit that has one or more than one input and only one output.** The input controls the output and the logic is isomorphic with [Boolean connectives](../../Logic/Truth-functional_connectives.md) defined in terms of [truth-tables](../../Logic/Truth-tables.md).
+
+> [A gate consists in] three connections where there may or may not be some electricity. Two of those connections are places where electricity may be put into the device, and the third connection is a place where electricity may come out of the device. (Scott, 2009)
+
+## References
+
+Scott, J. Clark. 2009. _But how do it know?: the basic principles of computers for everyone_. Self-published.
diff --git a/Hardware/Logic_Gates/Nand_gate.md b/Hardware/Logic_Gates/Nand_gate.md
index aa318d4..c793c6a 100644
--- a/Hardware/Logic_Gates/Nand_gate.md
+++ b/Hardware/Logic_Gates/Nand_gate.md
@@ -3,7 +3,7 @@ tags:
   - Logic
   - Electronics
   - Hardware
-  - logic-gates
+  - logic_gates
 ---
 
 # NAND gate
@@ -32,9 +32,9 @@ Diagram representing NAND gate:
 * It is only when both switches are on, that the output is off (corresponding to `true` `true` )
 
 
-This is the exact opposite to the truth-conditions for `AND`.
+This is the exact opposite to the truth-conditions for AND.
 
-## Transliterating the logic truth table to the switch behaviour
+## Transliterating the logic truth-table to the switch behaviour
 
 We can now present a truth table for NAND along side that for AND: 
 
@@ -59,7 +59,7 @@ We can see that it inverts the value of AND.
 ## Significance of the NAND gate: functional completeness
 > **Equipped with just a NAND we can represent every other possible logical condition within a circuit.**
 
-In practice, it is more efficient to use specific dedicated gates for the other Boolean connectives but in principle the same output can be achieved through NANDs alone.  
+In practice, it is more efficient to use specific dedicated gates (i.e OR, AND, NOT etc) for the other Boolean connectives but in principle the same output can be achieved through NANDs alone.  
 
 
 ## More complex outputs from combining NANDS