diff --git a/ChangeLog b/ChangeLog
index 563da96328..d32aca1d28 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jul 11 18:37:37 2003  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* instruby: do not handle directories. [ruby-dev:20613]
+
 Fri Jul 11 16:09:09 2003  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* util.c (ruby_strtod): exp should be less than MDMAXEXPT.
diff --git a/instruby.rb b/instruby.rb
index 362b25bfcb..3f39865eff 100644
--- a/instruby.rb
+++ b/instruby.rb
@@ -179,7 +179,7 @@ if RUBY_PLATFORM =~ /mswin32|mingw|bccwin32/
 end
 
 Dir.glob("*.[1-9]") do |mdoc|
-  next unless open(mdoc){|fh| fh.read(1) == '.'}
+  next unless File.file?(mdoc) and open(mdoc){|fh| fh.read(1) == '.'}
 
   section = mdoc[-1,1]