diff --git a/.gitignore b/.gitignore
index 259148f..287255b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,32 +1,2 @@
-# Prerequisites
-*.d
-
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-*.smod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
+*.lst
+a.out
diff --git a/chapter3/.gitignore b/chapter3/.gitignore
index 18da2f4..52e7977 100644
--- a/chapter3/.gitignore
+++ b/chapter3/.gitignore
@@ -1,2 +1,3 @@
 mmap_example
+pmem_map_file
 testfile
diff --git a/chapter3/Makefile b/chapter3/Makefile
index 64b0120..a96419d 100644
--- a/chapter3/Makefile
+++ b/chapter3/Makefile
@@ -1,21 +1,21 @@
 # Copyright (c) 2019, Intel Corporation
-# 
+#
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
-# 
+#
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
-# 
+#
 #     * Redistributions in binary form must reproduce the above copyright
 #       notice, this list of conditions and the following disclaimer in
 #       the documentation and/or other materials provided with the
 #       distribution.
-# 
+#
 #     * Neither the name of Intel Corporation nor the names of its
 #       contributors may be used to endorse or promote products derived
 #       from this software without specific prior written permission.
-# 
+#
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
@@ -32,15 +32,25 @@
 # Makefile for chapter3 examples
 #
 
-all: mmap_example
+.SUFFIXES: .lst
+
+all: mmap_example pmem_map_file listings
+
+listings: mmap_example.lst pmem_map_file.lst map_file_windows_example.lst
+
+.c.lst:
+	cat -n $^ > $@
 
 mmap_example: mmap_example.c
-	$(CC) -o $@ $^
+	$(CC) -o mmap_example mmap_example.c
+
+pmem_map_file: pmem_map_file.c
+	$(CC) -o pmem_map_file pmem_map_file.c -lpmem
 
 clean:
 	$(RM) *.o core a.out testfile
 
 clobber: clean
-	$(RM) mmap_example
+	$(RM) mmap_example pmem_map_file *.lst
 
 .PHONY: all clean clobber
diff --git a/chapter3/map_file_windows_example.c b/chapter3/map_file_windows_example.c
old mode 100755
new mode 100644
index 969c7ae..46151e4
--- a/chapter3/map_file_windows_example.c
+++ b/chapter3/map_file_windows_example.c
@@ -29,6 +29,19 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
+/*
+ * map_file_windows_example.c -- windows memory mapped file example
+ *
+ * This file memory-maps a file and stores a string to it.  It is
+ * a quick example of how to use MapViewOfFileEx() and how to flush
+ * changes to the file.
+ *
+ * To run this example, provide a single argument, which is the name of
+ * a test file that is at least 4k in length.  This program will overwrite
+ * the file contents!
+ */
+
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -117,7 +130,8 @@ main(int argc, char *argv[])
 
 	/* Explicitly unmap before closing the file */
 	if (UnmapViewOfFile(pmaddr) == FALSE) {
-		fprintf(stderr, "UnmapViewOfFile, gle: 0x%08x", GetLastError());
+		fprintf(stderr, "UnmapViewOfFile, gle: 0x%08x",
+			GetLastError());
 		exit(1);
 	}
 
@@ -125,6 +139,5 @@ main(int argc, char *argv[])
 	CloseHandle(fh);
 
 	printf("Done.\n");
-
 	exit(0);
 }
diff --git a/chapter3/pmem_map_file.c b/chapter3/pmem_map_file.c
index 5d1b48c..8fe33ae 100644
--- a/chapter3/pmem_map_file.c
+++ b/chapter3/pmem_map_file.c
@@ -56,22 +56,31 @@ main(int argc, char *argv[])
 	size_t mapped_len;
 	int is_pmem;
 
-	/* create a pmem file and memory map it */
-	if ((pmemaddr = pmem_map_file(PATH, PMEM_LEN, PMEM_FILE_CREATE,
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s filename\n", argv[0]);
+		exit(1);
+	}
+
+	/* Create a pmem file and memory map it. */
+	if ((pmemaddr = pmem_map_file(argv[1], PMEM_LEN, PMEM_FILE_CREATE,
 				0666, &mapped_len, &is_pmem)) == NULL) {
 		perror("pmem_map_file");
 		exit(1);
 	}
 
-	/* store a string to the persistent memory */
-	strcpy(pmemaddr, "hello, persistent memory");
+	/* Store a string to the persistent memory. */
+	char s[] = "This is new data written to the file";
+	strcpy(pmemaddr, s);
 
-	/* flush our string to persistence */
+	/* Flush our string to persistence. */
 	if (is_pmem)
-		pmem_persist(pmemaddr, mapped_len);
+		pmem_persist(pmemaddr, sizeof(s));
 	else
-		pmem_msync(pmemaddr, mapped_len);
+		pmem_msync(pmemaddr, sizeof(s));
 
 	/* Delete the mappings. */
 	pmem_unmap(pmemaddr, mapped_len);
+
+	printf("Done.\n");
+	exit(0);
 }