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diff --git a/guides/source/configuring.md b/guides/source/configuring.md
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@@ -672,6 +672,8 @@ There are a few configuration options available in Active Support:
* `config.active_support.time_precision` sets the precision of JSON encoded time values. Defaults to `3`.
+* `config.active_support.use_sha1_digests` specifies whether to use SHA-1 instead of MD5 to generate non-sensitive digests, such as the ETag header. Defaults to false.
+
* `ActiveSupport::Logger.silencer` is set to `false` to disable the ability to silence logging in a block. The default is `true`.
* `ActiveSupport::Cache::Store.logger` specifies the logger to use within cache store operations.