diff --git a/18_0_Understanding_Your_Lightning_Setup.md b/18_0_Understanding_Your_Lightning_Setup.md
index 98c090f..5080c66 100644
--- a/18_0_Understanding_Your_Lightning_Setup.md
+++ b/18_0_Understanding_Your_Lightning_Setup.md
@@ -29,6 +29,6 @@ Supporting objectives include the ability to:
 * [Section One: Verifying Your Lightning Setup](18_1_Verifying_Your_Lightning_Setup.md)
 * [Section Two: Knowing Your Lightning Setup](18_2_Knowing_Your_lightning_Setup.md)
 * [Section Three: Setting Up a channel](18_3_Setting_Up_a_Channel.md)
-* [Section Four: Generate a payment request](18_4_Generate_a_Payment_Request.md)
-* [Section Five: Paying an invoice](18_5_Paying_a_Invoice.md)
-* [Section Five: Closing a Channel](18_6_Closing_a_Channel.md)
+* [Section Four: Generate a payment request](19_1_Generate_a_Payment_Request.md)
+* [Section Five: Paying an invoice](19_2_Paying_a_Invoice.md)
+* [Section Five: Closing a Channel](19_3_Closing_a_Channel.md)