mutable/servermap.py: update comment. Closes #1231.

diff --git a/src/allmydata/mutable/servermap.py b/src/allmydata/mutable/servermap.py
index 3dfb36f229504ea0a14bf6296a048346cf84d181..6478afcbe3a96f587064745edd47625e5217af84 100644 (file)
--- a/src/allmydata/mutable/servermap.py
+++ b/src/allmydata/mutable/servermap.py
@@ -372,8 +372,8 @@ class ServermapUpdater:
         #   * the offset table tells us the 'ish', also the positive offset
         # A future version of the SMDF slot format should consider using
         # fixed-size slots so we can retrieve less data. For now, we'll just
-        # read 2000 bytes, which also happens to read enough actual data to
-        # pre-fetch a 9-entry dirnode.
+        # read 4000 bytes, which also happens to read enough actual data to
+        # pre-fetch an 18-entry dirnode.
         self._read_size = 4000
         if mode == MODE_CHECK:
             # we use unpack_prefix_and_signature, so we need 1k