diff --git a/docs/command-line/prometheus.md b/docs/command-line/prometheus.md
index 2232602430..2faf65105e 100644
--- a/docs/command-line/prometheus.md
+++ b/docs/command-line/prometheus.md
@@ -30,7 +30,7 @@ The Prometheus monitoring server
 | <code class="text-nowrap">--web.console.templates</code> | Path to the console template directory, available at /consoles. | `consoles` |
 | <code class="text-nowrap">--web.console.libraries</code> | Path to the console library directory. | `console_libraries` |
 | <code class="text-nowrap">--web.page-title</code> | Document title of Prometheus instance. | `Prometheus Time Series Collection and Processing Server` |
-| <code class="text-nowrap">--web.cors.origin</code> | Regex for CORS origin. It is fully anchored. Example: 'https?://(domain1|domain2)\.com' | `.*` |
+| <code class="text-nowrap">--web.cors.origin</code> | Regex for CORS origin. It is fully anchored. Example: 'https?://(domain1\|domain2)\.com' | `.*` |
 | <code class="text-nowrap">--storage.tsdb.path</code> | Base path for metrics storage. Use with server mode only. | `data/` |
 | <code class="text-nowrap">--storage.tsdb.retention</code> | [DEPRECATED] How long to retain samples in storage. This flag has been deprecated, use "storage.tsdb.retention.time" instead. Use with server mode only. |  |
 | <code class="text-nowrap">--storage.tsdb.retention.time</code> | How long to retain samples in storage. When this flag is set it overrides "storage.tsdb.retention". If neither this flag nor "storage.tsdb.retention" nor "storage.tsdb.retention.size" is set, the retention time defaults to 15d. Units Supported: y, w, d, h, m, s, ms. Use with server mode only. |  |
diff --git a/util/documentcli/documentcli.go b/util/documentcli/documentcli.go
index 720a7c9c7f..9de2bb8d4c 100644
--- a/util/documentcli/documentcli.go
+++ b/util/documentcli/documentcli.go
@@ -75,7 +75,7 @@ func createFlagRow(flag *kingpin.FlagModel) []string {
 		name = fmt.Sprintf(`<code class="text-nowrap">-%c</code>, <code class="text-nowrap">--%s</code>`, flag.Short, flag.Name)
 	}
 
-	return []string{name, flag.Help, defaultVal}
+	return []string{name, strings.ReplaceAll(flag.Help, "|", `\|`), defaultVal}
 }
 
 func writeFlagTable(writer io.Writer, level int, fgm *kingpin.FlagGroupModel) error {