diff --git a/ChangeLog b/ChangeLog
index 03e0d5a2ff..f4485247a7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed May 18 05:29:26 2011  Eric Hodel  <drbrain@segment7.net>
+
+	* lib/webrick/compat.rb:  Improve documentation.  Patch by Sandor
+	  Szücs.  [Ruby 1.9 - Bug #4725]
+
 Wed May 18 05:10:35 2011  Eric Hodel  <drbrain@segment7.net>
 
 	* lib/tracer.rb:  Improve documentation.  Patch by Richard Ramsden.
diff --git a/lib/webrick/compat.rb b/lib/webrick/compat.rb
index ad7760b640..33521f0a76 100644
--- a/lib/webrick/compat.rb
+++ b/lib/webrick/compat.rb
@@ -8,8 +8,28 @@
 #
 # $IPR: compat.rb,v 1.6 2002/10/01 17:16:32 gotoyuzo Exp $
 
+##
+# System call error module used by webrick for cross platform compatability.
+#
+# EPROTO:: protocol error
+# ECONNRESET:: remote host reset the connection request
+# ECONNABORTED:: Client sent TCP reset (RST) before server has accepted the
+#                connection requested by client.
+#
 module Errno
+  ##
+  # Protocol error.
+
   class EPROTO       < SystemCallError; end
+
+  ##
+  # Remote host reset the connection request.
+
   class ECONNRESET   < SystemCallError; end
+
+  ##
+  # Client sent TCP reset (RST) before server has accepted the connection
+  # requested by client.
+
   class ECONNABORTED < SystemCallError; end
 end