Document SQL_WARNING_THRESHOLD.

Fix #429.

2 files changed, 2 insertions, 1 deletions

diff --git a/debug_toolbar/utils/settings.py b/debug_toolbar/utils/settings.py
index 482781b..af9821f 100644
--- a/debug_toolbar/utils/settings.py
+++ b/debug_toolbar/utils/settings.py
@@ -19,6 +19,7 @@ CONFIG_DEFAULTS = {
         'debug_toolbar',
     ),
     'ROOT_TAG_ATTRS': '',
+    'SQL_WARNING_THRESHOLD': 500,   # milliseconds
 }
 
 
diff --git a/debug_toolbar/utils/tracking/db.py b/debug_toolbar/utils/tracking/db.py
index 7b8092c..dd49e39 100644
--- a/debug_toolbar/utils/tracking/db.py
+++ b/debug_toolbar/utils/tracking/db.py
@@ -135,7 +135,7 @@ class NormalCursorWrapper(object):
                 'stacktrace': stacktrace,
                 'start_time': start_time,
                 'stop_time': stop_time,
-                'is_slow': (duration > CONFIG.get('SQL_WARNING_THRESHOLD', 500)),
+                'is_slow': duration > CONFIG['SQL_WARNING_THRESHOLD'],
                 'is_select': sql.lower().strip().startswith('select'),
                 'template_info': template_info,
             }