diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index cbd233a..dc58f1c 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*      For Vim version 7.0aa.  Last change: 2005 Jan 27
+*eval.txt*      For Vim version 7.0aa.  Last change: 2005 Jan 31
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1458,6 +1458,7 @@
 inputsecret( {prompt} [, {text}]) String  like input() but hiding the text
 insert( {list}, {item} [, {idx}]) List	insert {item} in {list} [before {idx}]
 isdirectory( {directory})	Number	TRUE if {directory} is a directory
+islocked( {expr})		Number	TRUE if {expr} is locked
 items( {dict})			List	List of key-value pairs in {dict}
 join( {list} [, {sep}])		String	join {list} items into one String
 keys( {dict})			List	List of keys in {dict}
@@ -2783,6 +2784,19 @@
 		exist, or isn't a directory, the result is FALSE.  {directory}
 		is any expression, which is used as a String.
 
+islocked({expr})					*islocked()*
+		The result is a Number, which is non-zero when {expr} is the
+		name of a locked variable.
+		{expr} must be the name of a variable, List item or Dictionary
+		entry, not the variable itself!  Example: >
+			:let alist = [0, ['a', 'b'], 2, 3]
+			:lockvar 1 alist
+			:echo islocked('alist')		" 1
+			:echo islocked('alist[1]')	" 0
+
+<		When {expr} is a variable that does not exist you get an error
+		message.  Use |exists()| to check for existance.
+
 items({dict})						*items()*
 		Return a List with all the key-value pairs of {dict}.  Each
 		List item is a list with two items: the key of a {dict} entry
@@ -4161,7 +4175,14 @@
 arguments an argument "..." can be specified, which means that more arguments
 may optionally be following.  In the function the extra arguments can be used
 as "a:1", "a:2", etc.  "a:0" is set to the number of extra arguments (which
-can be 0).  "a:000" is set to a List that contains these arguments.
+can be 0).  "a:000" is set to a List that contains these arguments.  Note that
+"a:1" is the same as "a:000[0]".
+								*E742*
+The a: scope and the variables in it cannot be changed, they are fixed.
+However, if a List or Dictionary is used, you can changes their contents.
+Thus you can pass a List to a function and have the function add an item to
+it.  If you want to make sure the function cannot change a List or Dictionary
+use |:lockvar|.
 
 When not using "...", the number of arguments in a function call must be equal
 to the number of named arguments.  When using "...", the number of arguments
@@ -4457,10 +4478,11 @@
 				#	Number
 			    	*	Funcref
 
-							*:unlet* *:unl* *E108*
-:unl[et][!] {var-name} ...
-			Remove the internal variable {var-name}.  Several
-			variable names can be given, they are all removed.
+
+:unl[et][!] {name} ...					*:unlet* *:unl* *E108*
+			Remove the internal variable {name}.  Several variable
+			names can be given, they are all removed.  The name
+			may also be a List or Dictionary item.
 			With [!] no error message is given for non-existing
 			variables.
 			One or more items from a List can be removed: >
@@ -4470,6 +4492,52 @@
 				:unlet dict['two']
 				:unlet dict.two
 
+:lockv[ar][!] [depth] {name} ...			*:lockvar* *:lockv*
+			Lock the internal variable {name}.  Locking means that
+			it can no longer be changed (until it is unlocked).
+			A locked variable can be deleted: >
+				:lockvar v
+				:let v = 'asdf'		" fails!
+				:unlet v
+<							*E741*
+			If you try to change a locked variable you get an
+			error message: "E741: Value of {name} is locked"
+
+			[depth] is relevant when locking a List or Dictionary.
+			It specifies how deep the locking goes:
+				1	Lock the List or Dictionary itself,
+					cannot add or remove items, but can
+					still change their values.
+				2	Also lock the values, cannot change
+					the items.  If an item is a List or
+					Dictionary, cannot add or remove
+					items, but can still change the
+					values.
+				3	Like 2 but for the List/Dictionary in
+					the List/Dictionary, one level deeper.
+			The default [depth] is 2, thus when {name} is a List
+			or Dictionary the values cannot be changed.
+								*E743*
+			For unlimited depth use [!] and omit [depth].
+			However, there is a maximum depth of 100 to catch
+			loops.
+
+			Note that when two variables refer to the same List
+			and you lock one of them, the List will also be locked
+			when used through the other variable.  Example: >
+				:let l = [0, 1, 2, 3]
+				:let cl = l
+				:lockvar l
+				:let cl[1] = 99		" won't work!
+<			You may want to make a copy of a list to avoid this.
+			See |deepcopy()|.
+
+
+:unlo[ckvar][!] [depth] {name} ...			*:unlockvar* *:unlo*
+			Unlock the internal variable {name}.  Does the
+			opposite of |:lockvar|.
+
+
 :if {expr1}			*:if* *:endif* *:en* *E171* *E579* *E580*
 :en[dif]		Execute the commands until the next matching ":else"
 			or ":endif" if {expr1} evaluates to non-zero.