diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 072f69f2e..a4769a8ae 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -618,7 +618,8 @@ def _real_main(argv=None):
         'min_filesize': opts.min_filesize,
         'max_filesize': opts.max_filesize,
         'daterange': date,
-        'youtube_print_sig_code': opts.youtube_print_sig_code
+        'cachedir': opts.cachedir,
+        'youtube_print_sig_code': opts.youtube_print_sig_code,
         })
 
     if opts.verbose:
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index a9bfc455f..2dd2db673 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -438,7 +438,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         cache_dir = self._downloader.params.get('cachedir',
                                                 u'~/.youtube-dl/cache')
 
-        if cache_dir != u'NONE':
+        cache_enabled = cache_dir != u'NONE'
+        if cache_enabled:
             cache_fn = os.path.join(os.path.expanduser(cache_dir),
                                     u'youtube-sigfuncs',
                                     func_id + '.json')
@@ -465,7 +466,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         else:
             assert False, 'Invalid player type %r' % player_type
 
-        if cache_dir is not False:
+        if cache_enabled:
             try:
                 cache_res = res(map(compat_chr, range(slen)))
                 cache_spec = [ord(c) for c in cache_res]
@@ -515,7 +516,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         cache_spec = [ord(c) for c in cache_res]
         expr_code = u' + '.join(gen_sig_code(cache_spec))
         code = u'if len(s) == %d:\n    return %s\n' % (slen, expr_code)
-        self.to_screen(u'Extracted signature:\n' + code)
+        self.to_screen(u'Extracted signature function:\n' + code)
 
     def _parse_sig_js(self, jscode):
         funcname = self._search_regex(