diff --git a/docs/defs.md b/docs/defs.md
index 60ecff4c9f..8df9bb53a7 100644
--- a/docs/defs.md
+++ b/docs/defs.md
@@ -9,6 +9,25 @@
 * [rust_benchmark](#rust_benchmark)
 * [rust_test](#rust_test)
 * [rust_test_suite](#rust_test_suite)
+* [error_format](#error_format)
+
+<a id="#error_format"></a>
+
+## error_format
+
+<pre>
+error_format(<a href="#error_format-name">name</a>)
+</pre>
+
+A helper rule for controlling the rustc [--error-format](https://doc.rust-lang.org/rustc/command-line-arguments.html#option-error-format) flag.
+
+**ATTRIBUTES**
+
+
+| Name  | Description | Type | Mandatory | Default |
+| :------------- | :------------- | :------------- | :------------- | :------------- |
+| <a id="error_format-name"></a>name |  A unique name for this target.   | <a href="https://bazel.build/docs/build-ref.html#name">Name</a> | required |  |
+
 
 <a id="#rust_benchmark"></a>
 
diff --git a/docs/flatten.md b/docs/flatten.md
index 51a1cb2f60..243bd77512 100644
--- a/docs/flatten.md
+++ b/docs/flatten.md
@@ -7,6 +7,7 @@
 * [cargo_build_script](#cargo_build_script)
 * [crate](#crate)
 * [crate_universe](#crate_universe)
+* [error_format](#error_format)
 * [fail_when_enabled](#fail_when_enabled)
 * [incompatible_flag](#incompatible_flag)
 * [rust_analyzer](#rust_analyzer)
@@ -117,6 +118,24 @@ Environment Variables:
 | <a id="crate_universe-version"></a>version |  The version of cargo the resolver should use   | String | optional | "1.54.0" |
 
 
+<a id="#error_format"></a>
+
+## error_format
+
+<pre>
+error_format(<a href="#error_format-name">name</a>)
+</pre>
+
+A helper rule for controlling the rustc [--error-format](https://doc.rust-lang.org/rustc/command-line-arguments.html#option-error-format) flag.
+
+**ATTRIBUTES**
+
+
+| Name  | Description | Type | Mandatory | Default |
+| :------------- | :------------- | :------------- | :------------- | :------------- |
+| <a id="error_format-name"></a>name |  A unique name for this target.   | <a href="https://bazel.build/docs/build-ref.html#name">Name</a> | required |  |
+
+
 <a id="#fail_when_enabled"></a>
 
 ## fail_when_enabled