diff --git a/8_3_Testing_a_Bitcoin_Script.md b/8_4_Testing_a_Bitcoin_Script.md
similarity index 99%
rename from 8_3_Testing_a_Bitcoin_Script.md
rename to 8_4_Testing_a_Bitcoin_Script.md
index aeb3910..60e17a8 100644
--- a/8_3_Testing_a_Bitcoin_Script.md
+++ b/8_4_Testing_a_Bitcoin_Script.md
@@ -1,6 +1,6 @@
 > **WARNING:** The lack of any code Script interpretors is currently halting this section.
 
-# 8.3: Testing a Bitcoin Script
+# 8.4: Testing a Bitcoin Script
 
 > **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.