update docs on totalCount for when using shared connection objects

website/pages/docs/plugins/prisma.mdx

@@ -1061,7 +1061,8 @@ builder.queryType({
   selections.
 - `totalCount`: A function for loading the total count for the connection. This will add a
   `totalCount` field to the connection object. The `totalCount` method will receive (`connection`,
-  `args`, `context`, `info`) as arguments
+  `args`, `context`, `info`) as arguments. Note that this will not work when using a shared
+  connection object (see details below)
 
 The created connection queries currently support the following combinations of connection arguments:
 
@@ -1117,7 +1118,8 @@ builder.prismaNode('User', {
 - `query`: A method that accepts the `args` and `context` for the connection field, and returns
   filtering and sorting logic that will be merged into the query for the relation.
 - `totalCount`: when set to true, this will add a `totalCount` field to the connection object. see
-  `relationCount` above for more details.
+  `relationCount` above for more details. Note that this will not work when using a shared
+  connection object (see details below)
 
 ### Indirect relations as connections
 
@@ -1290,6 +1292,57 @@ builder.prismaObjectFields('Post', (t) => ({
 }));
 ```
 
+### Total count on shared connection objects
+
+If you are set the `totalCount: true` on a `prismaConnection` or `relatedConnection` field, and are
+using a custom connection object, you will need to manually add the `totalCount` field to the
+connection object manually. The parent object on the connection will have a `totalCount` property
+that is either a the totalCount, or a function that will return the totalCount.
+
+```typescript
+const CommentConnection = builder.connectionObject({
+  type: Comment,
+  name: 'CommentConnection',
+  fields: (t) => ({
+    totalCount: t.int({
+      resolve: (connection) => {
+        const { totalCount } = connection as {
+          totalCount?: number | (() => number | Promise<number>);
+        };
+
+        return typeof totalCount === 'function' ? totalCount() : totalCount;
+      },
+    }),
+  }),
+});
+```
+
+If you want to add a global `totalCount` field, you can do something similar using
+`builder.globalConnectionField`:
+
+```typescript
+export const builder = new SchemaBuilder<{
+  PrismaTypes: PrismaTypes;
+  Connection: {
+    totalCount: number | (() => number | Promise<number>);
+  };
+}>({
+  plugins: [PrismaPlugin, RelayPlugin],
+  relayOptions: {},
+  prisma: {
+    client: db,
+  },
+});
+
+builder.globalConnectionField('totalCount', (t) =>
+  t.int({
+    nullable: false,
+    resolve: (parent) =>
+      typeof parent.totalCount === 'function' ? parent.totalCount() : parent.totalCount,
+  }),
+);
+```
+
 ### Relay Utils
 
 #### `parsePrismaCursor` and `formatPrismaCursor`