diff --git a/SC3040.md b/SC3040.md
index 450088d..97f14db 100644
--- a/SC3040.md
+++ b/SC3040.md
@@ -1,5 +1,8 @@
-## In POSIX sh, set option pipefail is undefined.
+## In POSIX sh, set option <option> is undefined.
 
+This applies to any POSIX code: `set -o <option>` is **undefined**.
+
+Examples follow:
 ### Problematic code:
 
 ```sh