diff --git a/changelog b/changelog
index 3693260..267a1c5 100644
--- a/changelog
+++ b/changelog
@@ -1,3 +1,10 @@
+Version 3.1 - Sep 21, 2014
+
+    * add optional parameter --end-at=NUM to F3.
+    * add script f3write.h2w.
+    * unify Makefile.
+    * general code review.
+
 Version 3.0 - May 14, 2014
 
     * fix bug first reported by John Lussmyer.
@@ -7,7 +14,7 @@ Version 3.0 - May 14, 2014
 
 Version 2.2 - Feb 8, 2013
 
-    * add option parameter --start-at=NUM to F3.
+    * add optional parameter --start-at=NUM to F3.
     * remove arbitrary limit on filenames.
     * fix bug first reported by Martin Theiss.
     * minor code refinements.
diff --git a/f3read.1 b/f3read.1
index d8ea400..1cdc708 100644
--- a/f3read.1
+++ b/f3read.1
@@ -1,5 +1,5 @@
 .\"Text automatically generated by txt2man
-.TH F3 "1"  "May 2013" "F3 3.0" "test real flash memory capacity"
+.TH F3 "1"  "September 2014" "F3 3.1" "test real flash memory capacity"
 .SH NAME
 \fBf3write, f3read \fP- test real flash memory capacity
 .SH SYNOPSIS
diff --git a/utils.c b/utils.c
index 64c1caf..a878431 100644
--- a/utils.c
+++ b/utils.c
@@ -209,7 +209,7 @@ const long *ls_my_files(const char *path, long start_at, long end_at)
 void print_header(FILE *f, const char *name)
 {
 	fprintf(f,
-	"F3 %s 3.0\n"
+	"F3 %s 3.1\n"
 	"Copyright (C) 2010 Digirati Internet LTDA.\n"
 	"This is free software; see the source for copying conditions.\n"
 	"\n", name);