diff --git a/src/components/ui/select/select.tsx b/src/components/ui/select/select.tsx
index b67ebe975..b74f8195e 100644
--- a/src/components/ui/select/select.tsx
+++ b/src/components/ui/select/select.tsx
@@ -3,18 +3,22 @@ import React from 'react';
 
 interface ISelect extends React.SelectHTMLAttributes<HTMLSelectElement> {
   children: Iterable<React.ReactNode>;
+  full?: boolean;
 }
 
 /** Multiple-select dropdown. */
 const Select = React.forwardRef<HTMLSelectElement, ISelect>((props, ref) => {
-  const { children, className, ...filteredProps } = props;
+  const { children, className, full = true, ...filteredProps } = props;
 
   return (
     <select
       ref={ref}
       className={clsx(
-        'w-full truncate rounded-md border-gray-300 py-2 pl-3 pr-10 text-base focus:border-primary-500 focus:outline-none focus:ring-primary-500 disabled:opacity-50 black:bg-black sm:text-sm dark:border-gray-800 dark:bg-gray-900 dark:text-gray-100 dark:ring-1 dark:ring-gray-800 dark:focus:border-primary-500 dark:focus:ring-primary-500',
+        'truncate rounded-md border-gray-300 py-2 pl-3 pr-10 text-base focus:border-primary-500 focus:outline-none focus:ring-primary-500 disabled:opacity-50 black:bg-black sm:text-sm dark:border-gray-800 dark:bg-gray-900 dark:text-gray-100 dark:ring-1 dark:ring-gray-800 dark:focus:border-primary-500 dark:focus:ring-primary-500',
         className,
+        {
+          'w-full': full,
+        },
       )}
       {...filteredProps}
     >
diff --git a/src/features/nostr-relays/components/relay-editor.tsx b/src/features/nostr-relays/components/relay-editor.tsx
index 6f6a5ae41..0806e9300 100644
--- a/src/features/nostr-relays/components/relay-editor.tsx
+++ b/src/features/nostr-relays/components/relay-editor.tsx
@@ -1,6 +1,7 @@
 import React from 'react';
+import { FormattedMessage } from 'react-intl';
 
-import { HStack, Input } from 'soapbox/components/ui';
+import { HStack, Input, Select } from 'soapbox/components/ui';
 import Streamfield, { StreamfieldComponent } from 'soapbox/components/ui/streamfield/streamfield';
 import { useInstance } from 'soapbox/hooks';
 
@@ -45,15 +46,31 @@ const RelayField: StreamfieldComponent<RelayData> = ({ value, onChange }) => {
     };
   };
 
+  const handleMarkerChange = (e: React.ChangeEvent<HTMLSelectElement>): void => {
+    onChange({ ...value, marker: (e.currentTarget.value as 'read' | 'write' | '') || undefined });
+  };
+
   return (
     <HStack space={2} grow>
       <Input
         type='text'
-        outerClassName='w-2/5 grow'
+        outerClassName='w-full grow'
         value={value.url}
         onChange={handleChange('url')}
         placeholder={instance.nostr?.relay ?? `wss://${instance.domain}/relay`}
       />
+
+      <Select className='mt-1' full={false} onChange={handleMarkerChange}>
+        <option value='' selected={value.marker === undefined}>
+          <FormattedMessage id='nostr_relays.read_write' defaultMessage='Read & write' />
+        </option>
+        <option value='read' selected={value.marker === 'read'}>
+          <FormattedMessage id='nostr_relays.read_only' defaultMessage='Read-only' />
+        </option>
+        <option value='write' selected={value.marker === 'write'}>
+          <FormattedMessage id='nostr_relays.write_only' defaultMessage='Write-only' />
+        </option>
+      </Select>
     </HStack>
   );
 };