Update chapters/35.markdown
Note that you can’t use negative indices with strings, only slices with negative indices.
    
        | author | ZyX-I <kp-pav@ya.ru> | 
    
        | date | Sun, 19 Aug 2012 12:57:07 +0400 | 
    
    
        | parents | 7a638cd48d48 | 
    
        | children | 255d5232b0f6 | 
    
        | branches/tags | (none) | 
    
        | files | chapters/35.markdown | 
Changes
    
--- a/chapters/35.markdown	Sat Jun 16 16:25:45 2012 -0400
+++ b/chapters/35.markdown	Sun Aug 19 12:57:07 2012 +0400
@@ -76,7 +76,12 @@
     :::vim
     :echo "abcd"[0:2]
 
-Vim displays "abc".
+Vim displays "abc". It does not allow you to use negative indices with strings though:
+
+    :::vim
+    :echo "abcd"[-1] "abcd"[-1:]
+
+will echo " d".
 
 Concatenation
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