diff --git a/ext/socket/lib/socket.rb b/ext/socket/lib/socket.rb
index d7bd760..afe7e37 100644
--- a/ext/socket/lib/socket.rb
+++ b/ext/socket/lib/socket.rb
@@ -29,6 +29,12 @@ class Addrinfo
     end
   end
 
+  # creates a new +Socket+ connected to the address of local_addrinfo.
+  #
+  # If no arguments are given, the address of the socket is not bound.
+  #
+  # If +block+ is given, calls the +socket+ for each member of the block.
+  #
   def connect_internal(local_addrinfo)
     sock = Socket.new(self.pfamily, self.socktype, self.protocol)
     begin
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 260875f..2d1fbf0 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1013,6 +1013,10 @@ SRC
   end
 end
 
+# Returns whether or not the static type +type+ is defined.
+#
+# See also +have_type+
+#
 def try_type(type, headers = nil, opt = "", &b)
   if try_compile(<<"SRC", opt, &b)
 #{cpp_include(headers)}
@@ -1066,6 +1070,10 @@ def find_type(type, opt, *headers, &b)
   end
 end
 
+# Returns whether or not the Constant +const+ is defined.
+#
+# See also +have_const+
+#
 def try_const(const, headers = nil, opt = "", &b)
   const, type = *const
   if try_compile(<<"SRC", opt, &b)
@@ -1730,6 +1738,8 @@ preload = #{defined?($preload) && $preload ? $preload.join(' ') : ''}
 end
 # :startdoc:
 
+# creates a stub Makefile.
+#
 def dummy_makefile(srcdir)
   configuration(srcdir) << <<RULES << CLEANINGS
 CLEANFILES = #{$cleanfiles.join(' ')}
@@ -1742,6 +1752,11 @@ all install static install-so install-rb: Makefile
 RULES
 end
 
+# Processes the data contents of the "depend" file.
+# Each line of this file is expected to be a file name.
+# 
+# Returns the output of findings, in Makefile format.
+#
 def depend_rules(depend)
   suffixes = []
   depout = []
diff --git a/lib/rexml/quickpath.rb b/lib/rexml/quickpath.rb
index 06cb4f9..fcb6875 100644
--- a/lib/rexml/quickpath.rb
+++ b/lib/rexml/quickpath.rb
@@ -6,6 +6,8 @@ module REXML
     include Functions
     include XMLTokens
 
+    # A base +Hash+ object to be used when initializing a
+    # default empty namespaces set.
     EMPTY_HASH = {}
 
     def QuickPath::first element, path, namespaces=EMPTY_HASH
diff --git a/lib/rexml/xpath.rb b/lib/rexml/xpath.rb
index 5f7ecef..34ddb74 100644
--- a/lib/rexml/xpath.rb
+++ b/lib/rexml/xpath.rb
@@ -5,6 +5,9 @@ module REXML
   # Wrapper class.  Use this class to access the XPath functions.
   class XPath
     include Functions
+    # A base +Hash+ object, supposing to be used when initializing a
+    # default empty namespaces set, but is currently unused.
+    # TODO: either set the namespaces=EMPTY_HASH, or deprecate this.
     EMPTY_HASH = {}
 
     # Finds and returns the first node that matches the supplied xpath.
diff --git a/lib/rexml/xpath_parser.rb b/lib/rexml/xpath_parser.rb
index 3bffd38..adc3417 100644
--- a/lib/rexml/xpath_parser.rb
+++ b/lib/rexml/xpath_parser.rb
@@ -5,20 +5,30 @@ require 'rexml/syncenumerator'
 require 'rexml/parsers/xpathparser'
 
 class Object
+  # provides a unified +clone+ operation, for +REXML::XPathParser+
+  # to use across multiple +Object+ types
   def dclone
     clone
   end
 end
 class Symbol
+  # provides a unified +clone+ operation, for +REXML::XPathParser+
+  # to use across multiple +Object+ types
   def dclone ; self ; end
 end
 class Fixnum
+  # provides a unified +clone+ operation, for +REXML::XPathParser+
+  # to use across multiple +Object+ types
   def dclone ; self ; end
 end
 class Float
+  # provides a unified +clone+ operation, for +REXML::XPathParser+
+  # to use across multiple +Object+ types
   def dclone ; self ; end
 end
 class Array
+  # provides a unified +clone+ operation, for +REXML::XPathParser+
+  # to use across multiple +Object+ types
   def dclone
     klone = self.clone
     klone.clear
diff --git a/object.c b/object.c
index fad726c..f4a28fd 100644
--- a/object.c
+++ b/object.c
@@ -97,6 +97,15 @@ rb_obj_equal(VALUE obj1, VALUE obj2)
     return Qfalse;
 }
 
+/* 
+ * Generates a <code>Fixnum</code> hash value for this object. This function must have the
+ * property that a.eql?(b) implies a.hash <code>==</code> b.hash. The hash value is used by
+ * class <code>Hash</code>. Any hash value that exceeds the capacity of a <code>Fixnum</code> will be
+ * truncated before being used.
+ *
+ * 	"waffle"	#=> "waffle"
+ * 	"waffle".hash	#=> -910576647
+ */
 VALUE
 rb_obj_hash(VALUE obj)
 {
@@ -1774,10 +1783,10 @@ rb_mod_const_defined(int argc, VALUE *argv, VALUE mod)
     return RTEST(recur) ? rb_const_defined(mod, id) : rb_const_defined_at(mod, id);
 }
 
-VALUE rb_obj_methods(int argc, VALUE *argv, VALUE obj);
-VALUE rb_obj_protected_methods(int argc, VALUE *argv, VALUE obj);
-VALUE rb_obj_private_methods(int argc, VALUE *argv, VALUE obj);
-VALUE rb_obj_public_methods(int argc, VALUE *argv, VALUE obj);
+VALUE rb_obj_methods(int argc, VALUE *argv, VALUE obj); /* in class.c */
+VALUE rb_obj_protected_methods(int argc, VALUE *argv, VALUE obj); /* in class.c */
+VALUE rb_obj_private_methods(int argc, VALUE *argv, VALUE obj); /* in class.c */
+VALUE rb_obj_public_methods(int argc, VALUE *argv, VALUE obj); /* in class.c */
 
 /*
  *  call-seq: