diff --git a/algs4/top_m.py b/algs4/top_m.py
index b1c3abe..8021d1a 100644
--- a/algs4/top_m.py
+++ b/algs4/top_m.py
@@ -1,3 +1,20 @@
+"""
+ * Execution:    python top_m.py m < input.txt
+ *  Data files:   https://algs4.cs.princeton.edu/24pq/tinyBatch.txt
+ *
+ *  Given an integer m from the command line and an input stream where
+ *  each line contains a String and a long value, this MinPQ client
+ *  prints the m lines whose numbers are the highest.
+ *
+ *  % python top_m.py 5 < tinyBatch.txt
+ *  Thompson    2/27/2000  4747.08
+ *  vonNeumann  2/12/1994  4732.35
+ *  vonNeumann  1/11/1999  4409.74
+ *  Hoare       8/18/1992  4381.21
+ *  vonNeumann  3/26/2002  4121.85
+ *
+ """
+
 import sys
 
 from algs4.min_pq import MinPQ
@@ -7,7 +24,6 @@
 M = int(sys.argv[1])
 pq = MinPQ()
 for line in sys.stdin:
-    Transaction(line)
     pq.insert(Transaction(line))
     if pq.size() > M:
         pq.del_min()