diff --git a/Custom-campaigns.md b/Custom-campaigns.md
index 0af92f5..aa3f3b9 100644
--- a/Custom-campaigns.md
+++ b/Custom-campaigns.md
@@ -109,6 +109,14 @@ Incorrect:
         - VFA-113
 ```
 
+Incorrect:
+```
+    - primary: SEAD
+      secondary: air-to-ground
+    - aircraft:
+        - VFA-113
+```
+
 Correct:
 ```
     - primary: SEAD