diff --git a/3_0_Understanding_Your_Bitcoin_Setup.md b/3_0_Understanding_Your_Bitcoin_Setup.md
index 8c45457..6d2ca6f 100644
--- a/3_0_Understanding_Your_Bitcoin_Setup.md
+++ b/3_0_Understanding_Your_Bitcoin_Setup.md
@@ -24,5 +24,6 @@ Supporting objectives include the ability to:
 * [Part One: Verifying Your Bitcoin Setup](3_1_Verifying_Your_Bitcoin_Setup.md)
 * [Part Two: Knowing Your Bitcoin Setup](3_2_Knowing_Your_Bitcoin_Setup.md)
 * [Part Three: Setting Up Your Wallet](3_3_Setting_Up_Your_Wallet.md)
+   * [Interlude: Using Command-Line Variables](3_3__Using_Command-Line_Variables.md)
 * [Part Four: Receiving a Transaction](3_4_Receiving_a_Transaction.md)