diff --git a/README.md b/README.md
index 51f9e50..31fda0d 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,18 @@ time: 240
 
 The recipe's file name isn't important, but it's good practice to make it something obvious, like `chocolate_cake.md` and not `strawberry_pie.md`.
 
-The recipe files are standard YAML. The extension should always be `.md` - other extensions will cause issues with subrecipes (see #1).
+The recipe files are standard YAML. Every recipe **must** begin and end with three dashes to ensure that Jekyll processes it.
+
+Good:
+```yaml
+---
+name: Example
+---
+```
+Bad:
+```yaml
+name: Example
+```
 
 ### Subrecipes
 Subrecipes behave a little differently to regular recipes: