Improve two comments.

1 files changed, 6 insertions, 2 deletions

diff --git a/tools/merge_fetch.py b/tools/merge_fetch.py
index be9edce..a31143e 100755
--- a/tools/merge_fetch.py
+++ b/tools/merge_fetch.py
@@ -175,8 +175,12 @@ def merge_fetch_parallel(args, config, localconfig):
         procs[name] = newworker(name, [args, localconfig, storagenode])
 
     currentsizefilecontent = ""
-    logorder = get_logorder(logorderfile) # List of hashes in log, hexencoded.
-    entries_in_log = set(logorder)        # Set of hashes in log, binary.
+    # Entries in log, kept in both a set and a list.
+    logorder = get_logorder(logorderfile) # Hashes are hexencoded.
+    entries_in_log = set(logorder)        # Hashes are binary.
+    # Entries to fetch, kept in both a set and a dict. The dict is
+    # keyed on hashes (binary) and contains randomised lists of nodes
+    # to fetch from.
     fetch_set = set()
     fetch_dict = {}
     while procs: