diff --git a/ChangeLog b/ChangeLog
index 6505d02f63..d1b471fd20 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat May 14 02:54:04 2011  Eric Hodel  <drbrain@segment7.net>
+
+	* lib/rexml/functions.rb:  Add some documentation for REXML::Functions.
+	  Patch by Sebastian Martinez.  [Ruby 1.9 - Feature #4688]
+
 Sat May 14 02:51:42 2011  Eric Hodel  <drbrain@segment7.net>
 
 	* lib/resolv.rb:  Hide private method and state-tracking constants from
diff --git a/lib/rexml/functions.rb b/lib/rexml/functions.rb
index 7a05d0cf9f..20c8961aee 100644
--- a/lib/rexml/functions.rb
+++ b/lib/rexml/functions.rb
@@ -28,6 +28,7 @@ module REXML
       end
     end
 
+    # Returns the last node of the given list of nodes.
     def Functions::last( )
       @@context[:size]
     end
@@ -36,6 +37,7 @@ module REXML
       @@context[:index]
     end
 
+    # Returns the size of the given list of nodes.
     def Functions::count( node_set )
       node_set.size
     end
@@ -129,6 +131,11 @@ module REXML
       end
     end
 
+    # A node-set is converted to a string by
+    # returning the concatenation of the string-value
+    # of each of the children of the node in the
+    # node-set that is first in document order.
+    # If the node-set is empty, an empty string is returned.
     def Functions::string_value( o )
       rv = ""
       o.children.each { |e|