diff --git a/assets/js/hooks/cell_editor/live_editor.js b/assets/js/hooks/cell_editor/live_editor.js
index 26e512561..79fb85d33 100644
--- a/assets/js/hooks/cell_editor/live_editor.js
+++ b/assets/js/hooks/cell_editor/live_editor.js
@@ -430,10 +430,13 @@ export default class LiveEditor {
         // to not distract the user too much as they are typing
         return wait(350).then(() => {
           const node = document.createElement("div");
-          const detail = document.createElement("div");
-          detail.classList.add("cm-completionInfoDetail");
-          detail.innerHTML = highlight(item.detail, this.language);
-          node.appendChild(detail);
+
+          if (item.detail) {
+            const detail = document.createElement("div");
+            detail.classList.add("cm-completionInfoDetail");
+            detail.innerHTML = highlight(item.detail, this.language);
+            node.appendChild(detail);
+          }
 
           if (item.documentation) {
             const docs = document.createElement("div");
diff --git a/assets/js/hooks/cell_editor/live_editor/codemirror/theme.js b/assets/js/hooks/cell_editor/live_editor/codemirror/theme.js
index c43521cf7..f4c906a46 100644
--- a/assets/js/hooks/cell_editor/live_editor/codemirror/theme.js
+++ b/assets/js/hooks/cell_editor/live_editor/codemirror/theme.js
@@ -238,8 +238,11 @@ function buildEditorTheme(colors, { dark }) {
         },
 
         "& .cm-completionInfoDocs": {
-          borderTop: `1px solid ${colors.separator}`,
           padding: "6px",
+
+          "&:not(:first-child)": {
+            borderTop: `1px solid ${colors.separator}`,
+          },
         },
       },