diff --git a/CHANGES.md b/CHANGES.md
index 9945fbf761..9baf22e1b0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,6 +7,7 @@
   (@panglesd, #976)
 - Separate compilation of interface and implementation files, using a new
   `compile-src` command (@panglesd, #1067).
+- Add clock emoji before `@since` tag (@yawaramin, #1089)
 
 ### Changed
 
diff --git a/src/html_support_files/odoc.css b/src/html_support_files/odoc.css
index 616ce2794e..4fa970c97a 100644
--- a/src/html_support_files/odoc.css
+++ b/src/html_support_files/odoc.css
@@ -725,7 +725,13 @@ td.def-doc *:first-child {
 /* Alert emoji */
 
 .alert::before, .deprecated::before {
-  content: '⚠️ ';
+  content: '⚠️ ' / '';
+}
+
+/* Since emoji */
+
+.since::before {
+  content: '🕚 ' / '';
 }
 
 /* Lists of modules */