diff --git a/Lib/pickletools.py b/Lib/pickletools.py
index cf5df41..43dedb3 100644
--- a/Lib/pickletools.py
+++ b/Lib/pickletools.py
@@ -2440,6 +2440,7 @@
         if opcode.name in ("PUT", "BINPUT", "LONG_BINPUT", "MEMOIZE"):
             if opcode.name == "MEMOIZE":
                 memo_idx = len(memo)
+                markmsg = "(as %d)" % memo_idx
             else:
                 assert arg is not None
                 memo_idx = arg
diff --git a/Misc/NEWS b/Misc/NEWS
index 142360e..2700ad3 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -56,6 +56,9 @@
 Library
 -------
 
+- Issue #25382: pickletools.dis() now outputs implicit memo index for the
+  MEMOIZE opcode.
+
 - Issue #25357: Add an optional newline paramer to binascii.b2a_base64().
   base64.b64encode() uses it to avoid a memory copy.