diff --git a/ChangeLog b/ChangeLog
index f9fc779761..33808bfaf5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Oct  3 23:37:17 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* ext/nkf/nkf.c, bin/ri, bin/irb: fixed typos in doc and comments.
+	  a patch from Eugene Ossintsev  <eugoss AT gmail.com>.
+
 Wed Oct  3 17:56:22 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* benchmark/driver.rb: enable specify label to executable.
diff --git a/bin/irb b/bin/irb
index f277bc4b69..c833aa866a 100644
--- a/bin/irb
+++ b/bin/irb
@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 #
-#   irb.rb - intaractive ruby
+#   irb.rb - interactive ruby
 #   	$Release Version: 0.9.5 $
 #   	$Revision$
 #   	$Date$
diff --git a/bin/ri b/bin/ri
index fb3e00eda3..ae793f6962 100755
--- a/bin/ri
+++ b/bin/ri
@@ -7,7 +7,7 @@
 #
 #   Class | Class::method | Class#method | Class.method | method
 #
-# All names may be abbreviated to their minimum unbiguous form. If a name
+# All names may be abbreviated to their minimum unambiguous form. If a name
 # _is_ ambiguous, all valid options will be listed.
 #
 # The form '.' method matches either class or instance methods, while 
diff --git a/ext/nkf/nkf.c b/ext/nkf/nkf.c
index 1cc582ac1a..460b536bdf 100644
--- a/ext/nkf/nkf.c
+++ b/ext/nkf/nkf.c
@@ -363,8 +363,8 @@ rb_nkf_guess2(VALUE obj, VALUE src)
  *
  *  == Description
  *
- *  This is a Ruby Extension version of nkf (Netowrk Kanji Filter).
- *  It converts the first argument and return converted result. Conversion
+ *  This is a Ruby Extension version of nkf (Network Kanji Filter).
+ *  It converts the first argument and returns converted result. Conversion
  *  details are specified by flags as the first argument.
  *
  *  *Nkf* is a yet another kanji code converter among networks, hosts and terminals.