diff --git a/TODO.md b/TODO.md
index 2df6e84..cefe5b4 100644
--- a/TODO.md
+++ b/TODO.md
@@ -14,6 +14,7 @@
 - [x] Slanted arrows
 - [x] Different types of arrow tips
 - [x] Sequence comment alignment
+- [x] Fix group size with syncs
 - [ ] Fix column spacing with notes over multiple columns
 - [ ] Fix notes with arrows from start / to end / small arrows
 - [ ] Fix group size with self arrows + notes
diff --git a/src/utils.typ b/src/utils.typ
index 95994df..b4eae86 100644
--- a/src/utils.typ
+++ b/src/utils.typ
@@ -21,6 +21,10 @@
       let (i0, i1) = get-group-span(participants, elmt)
       min-i = calc.min(min-i, i0)
       max-i = calc.max(max-i, i1)
+    } else if elmt.type == "sync" {
+      let (i0, i1) = get-group-span(participants, elmt)
+      min-i = calc.min(min-i, i0)
+      max-i = calc.max(max-i, i1)
     }
   }
   return (min-i, max-i)