diff --git a/pages/splatoon3/[[...slug]].tsx b/pages/splatoon3/[[...slug]].tsx
index ed63a5f1f..19002c58c 100644
--- a/pages/splatoon3/[[...slug]].tsx
+++ b/pages/splatoon3/[[...slug]].tsx
@@ -184,6 +184,18 @@ function Main() {
         Timeline
       </Heading>
       <UnorderedList listStyleType="none" ml="0">
+        <ListItem my={2}>
+          <Box as="span" fontSize="sm" fontWeight="bold" mr="2">
+            July 15, 2021
+          </Box>
+          First official art shown on{" "}
+          <MyLink
+            isExternal
+            href="https://twitter.com/SplatoonJP/status/1415495154111242246"
+          >
+            Twitter
+          </MyLink>{" "}
+        </ListItem>
         <ListItem my={2}>
           <Box as="span" fontSize="sm" fontWeight="bold" mr="2">
             July 6, 2021