diff --git a/src/components/cases/documents-tab.tsx b/src/components/cases/documents-tab.tsx
index 26b44e4..73d6c26 100644
--- a/src/components/cases/documents-tab.tsx
+++ b/src/components/cases/documents-tab.tsx
@@ -255,6 +255,56 @@ export function CaseDocumentsTab({ caseId }: { caseId: string }) {
     load();
   };
 
+  const renameFolder = async (full: string) => {
+    const parts = full.split("/");
+    const currentName = parts[parts.length - 1];
+    const parent = parts.slice(0, -1).join("/");
+    const raw = window.prompt(`Rename folder "${currentName}" to:`, currentName);
+    if (raw === null) return;
+    const trimmed = raw.trim();
+    if (!trimmed || trimmed === currentName) return;
+    const safe = sanitizeName(trimmed);
+    const newFull = parent ? `${parent}/${safe}` : safe;
+    if (folders.includes(newFull)) {
+      toast.error("A folder with that name already exists here");
+      return;
+    }
+
+    // Update all document rows whose folder == full or starts with full + "/"
+    const affectedDocs = docs.filter(
+      (d) => (d.folder || "") === full || (d.folder || "").startsWith(`${full}/`),
+    );
+    for (const d of affectedDocs) {
+      const next = d.folder === full ? newFull : `${newFull}${d.folder.slice(full.length)}`;
+      const { error } = await supabase.from("documents").update({ folder: next }).eq("id", d.id);
+      if (error) { toast.error("Rename failed", { description: error.message }); return; }
+    }
+
+    // Update folder rows (this folder + all descendants)
+    const affectedFolders = folders.filter((f) => f === full || f.startsWith(`${full}/`));
+    for (const f of affectedFolders) {
+      const next = f === full ? newFull : `${newFull}${f.slice(full.length)}`;
+      // Try update; if conflict (rare), delete old row instead
+      const { error } = await supabase
+        .from("document_folders")
+        .update({ path: next })
+        .eq("case_id", caseId)
+        .eq("path", f);
+      if (error) {
+        await supabase.from("document_folders").delete().eq("case_id", caseId).eq("path", f);
+        await ensureFolder(next);
+      }
+    }
+
+    // If we are currently inside the renamed folder, update the breadcrumb path
+    if (path === full || path.startsWith(`${full}/`)) {
+      setPath(newFull + path.slice(full.length));
+    }
+
+    toast.success("Folder renamed");
+    load();
+  };
+
   const crumbs = path ? path.split("/") : [];
 
   return (