diff --git a/SC2055.md b/SC2055.md
index 33abfe0..5f455aa 100644
--- a/SC2055.md
+++ b/SC2055.md
@@ -38,4 +38,12 @@ This statement is identical to `! [[ $1 = foo || $1 = bar ]]`, which also works
 
 ### Exceptions
 
-Rare.
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+Rare.
+
+* If I want to check that $FOO, $BAR and $COW are all equal:
+```
+if [[ $FOO != $BAR || $FOO != $COW ]]
+then
+    echo "$FOO and $BAR and $COW are not all equal"
+fi
+```
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