diff --git a/docs/reference/cli/options.md b/docs/reference/cli/options.md
index 2ee17c0..5c0c687 100644
--- a/docs/reference/cli/options.md
+++ b/docs/reference/cli/options.md
@@ -738,6 +738,39 @@ tls-allow-ca-clients
 
 Allows clients signed with trusted CA certificates to connect.
 
+### `vertx-worker-pool-size`
+
+<!--tabs-->
+
+# Syntax
+
+```bash title="Syntax"
+--vertx-worker-pool-size=<INTEGER>
+```
+
+# Example
+
+```bash
+--vertx-worker-pool-size=40
+```
+
+# Environment variable
+
+```bash
+WEB3SIGNER_VERTX_WORKER_POOL_SIZE=40
+```
+
+# Configuration file
+
+```bash
+vertx-worker-pool-size: 40
+```
+
+<!--/tabs-->
+
+Vert.x worker pool size used for processing requests.
+The default is `20`.
+
 ### `help`
 
 ```bash title="Syntax"
diff --git a/project-words.txt b/project-words.txt
index 8174b8d..c808d40 100644
--- a/project-words.txt
+++ b/project-words.txt
@@ -442,6 +442,7 @@ usbarmory
 vannicatte
 vercel
 verifymethod
+vertx
 vetter
 vfile
 vicenti