- Improved documentation.

autoload/neosnippet.vim

@@ -808,7 +808,8 @@ function! s:eval_snippet(snippet_text)"{{{
     endif
     let prev_match = matchend(a:snippet_text,
           \ '\\\@<!`.\{-}\\\@<!`', match)
-    let snip_word .= eval(a:snippet_text[match+1 : prev_match - 2])
+    sandbox let snip_word .= eval(
+          \ a:snippet_text[match+1 : prev_match - 2])
 
     let match = match(a:snippet_text, '\\\@<!`.\{-}\\\@<!`', prev_match)
   endwhile

doc/neosnippet.txt

@@ -334,6 +334,12 @@ Eval snippet feature is available.
 	prev_word   '^'
 	    `expand("%")`
 <
+Note: You want to use backticks in snippet, you must escape backticks.
+>
+	snippet code
+	abbr code
+	    \`${1}\`${2}
+<
 If you use |:NeoSnippetEdit| command for easy snippet editing, the file will
 be loaded automatically when you save the file.