diff --git a/docs/09-Data.md b/docs/09-Data.md
index 26cd9514a..aa2e79203 100644
--- a/docs/09-Data.md
+++ b/docs/09-Data.md
@@ -366,7 +366,26 @@ On next execution the obtained data will be compared with previously saved snaps
> To update a snapshot with a new data run tests in `--debug` mode.
By default Snapshot uses `assertEquals` assertion, however this can be customized by overriding `assertData` method.
+
+### Failed assertion output
+
+The assertion performed by `assertData` will not display the typical diff output from `assertEquals` or any customized failed assertion.
+To have the diff displayed when running tests, you can call the snapshot method `shouldShowDiffOnFail`:
+
+{% highlight php %}
+
+amOnPage('/categories');
+ // I want to see the diff in case the snapshot data changes
+ $snapshot->shouldShowDiffOnFail();
+ $snapshot->assert();
+}
+
+{% endhighlight %}
+If ever needed, the diff output can also be omitted by calling `shouldShowDiffOnFail(false)`.
## Conclusion
@@ -378,4 +397,4 @@ to operate with database through a data abstraction layer, and use the DataFacto
* **Next Chapter: [APITesting >](/docs/10-APITesting)**
-* **Previous Chapter: [< Customization](/docs/08-Customization)**
\ No newline at end of file
+* **Previous Chapter: [< Customization](/docs/08-Customization)**
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