Improve docs (#4478)

jestjs · Sep 13, 2017 · 105f7db · 105f7db
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diff --git a/docs/en/ExpectAPI.md b/docs/en/ExpectAPI.md
@@ -863,6 +863,8 @@ test('throws on octopus', () => {
 });
 ```
 
+> Note: You must wrap the code in a function, otherwise the error will not be caught and the assertion will fail.
+
 ### `.toThrowErrorMatchingSnapshot()`
 
 Use `.toThrowErrorMatchingSnapshot` to test that a function throws an error matching the most recent snapshot when it is called. For example, let's say you have a `drinkFlavor` function that throws whenever the flavor is `'octopus'`, and is coded like this: