diff --git a/ui/src/views/Baseline.jsx b/ui/src/views/Baseline.jsx
index c58b441..23611bd 100644
--- a/ui/src/views/Baseline.jsx
+++ b/ui/src/views/Baseline.jsx
@@ -409,7 +409,7 @@ export default function Baseline({ sources = [], sourceId, versions = [], versio
                   <th className="px-3 py-1.5 font-medium">#</th>
                   <th className="px-3 py-1.5 font-medium w-20">kind</th>
                   <th className="px-3 py-1.5 font-medium w-48">label</th>
-                  <th className="px-3 py-1.5 font-medium">note</th>
+                  <th className="px-3 py-1.5 font-medium w-full max-w-0">note</th>
                   <th className="px-3 py-1.5 font-medium w-36">counts toward</th>
                   <th className="px-3 py-1.5 font-medium text-right">rows</th>
                   <th className="px-3 py-1.5 font-medium text-right">{log[0]?.value_col || 'value'}</th>
@@ -464,8 +464,17 @@ export default function Baseline({ sources = [], sourceId, versions = [], versio
                                        focus:border-blue-400 rounded px-1 py-0.5 text-xs
                                        focus:outline-none bg-transparent" />
                         </td>
-                        <td className="px-3 py-2">
-                          {entry.note || <span className="text-gray-300">—</span>}
+                        {/* One line, clipped. The note is provenance -- it can run
+                            long -- and this row is eleven columns wide, so it used
+                            to wrap and push every row to two or three lines. w-full
+                            plus max-w-0 is what lets a cell in an auto-layout table
+                            absorb the slack and still clip: without the max-w-0 the
+                            column simply grows to fit the text. Expanding the row
+                            shows it in full. */}
+                        <td className="px-3 py-2 w-full max-w-0">
+                          {entry.note
+                            ? <div className="truncate" title={entry.note}>{entry.note}</div>
+                            : <span className="text-gray-300">—</span>}
                         </td>
                         <td className="px-3 py-2" onClick={e => e.stopPropagation()}>
                           <input