[prep] Improve error messages
diff --git a/src/prep.cc b/src/prep.cc
index 3ccbc6e..943bb45 100644
--- a/src/prep.cc
+++ b/src/prep.cc
@@ -13,7 +13,8 @@
   Buffer table(data, length);
 
   if (length >= 128 * 1024u) {
-    return Error("table length %ld > 120K", length);  // almost all prep tables are less than 9k bytes.
+    // almost all prep tables are less than 9k bytes.
+    return Error("Table length %ld > 120K", length);
   }
 
   if (!table.Skip(length)) {