diff --git a/crates/aura-cli/assets/graph-viewer.js b/crates/aura-cli/assets/graph-viewer.js
index 726c9c4..de400f1 100644
--- a/crates/aura-cli/assets/graph-viewer.js
+++ b/crates/aura-cli/assets/graph-viewer.js
@@ -70,7 +70,7 @@ function cellLabel(id, o, showTypes) {
     `<td port="${io}${i}" id="P_${id}_${io}${i}" href="#" colspan="${span(arr.length)}" ` +
     `bgcolor="${io === "i" ? "#222b33" : "#332b22"}"><font color="${col(k)}">${txt(n, k)}</font></td>`;
   const sp = o.params.map(([n, k]) => `<font color="${col(k)}">${showTypes && k ? `${n}:${k}` : n}</font>`);
-  const sig = o.params.length ? `<font color="#9399b2">(</font>${sp.join('<font color="#9399b2">, </font>')}<font color="#9399b2">)</font>` : "";
+  const sig = o.params.length ? `<font color="#9399b2">[</font>${sp.join('<font color="#9399b2">, </font>')}<font color="#9399b2">]</font>` : "";
   const name = `<font color="#f5f5f5"><b>${o.type}</b></font>${sig}`;
   let bodyRow;
   if (o.composite) {