diff --git a/README.md b/README.md
index aa9e4fc..5acf50c 100644
--- a/README.md
+++ b/README.md
@@ -324,7 +324,7 @@ try:
     config = read_config(PATH)
 except ReadError as ex:
     # Can also pass `set_level` to `critical`, not just to `error`.
-    wryter.error('Failed to read config ({})'.format(ex), {'context': context}, set_level='debug')
+    wryter.error('Failed to read config ({})'.format(ex), {'context': context}, _set_level='debug')
     # do_something to reread the file, but this time with debug logging enabled.
     config_file_read = True
 finally:
diff --git a/wryte.py b/wryte.py
index 428aef3..69f542e 100644
--- a/wryte.py
+++ b/wryte.py
@@ -390,16 +390,16 @@ def warning(self, message, *objects, **kwargs):
         self.logger.warning(obj)
 
     def error(self, message, *objects, **kwargs):
-        if kwargs.get('set_level'):
-            self.set_level(kwargs.get('set_level'))
-            kwargs.pop('set_level')
+        if kwargs.get('_set_level'):
+            self.set_level(kwargs.get('_set_level'))
+            kwargs.pop('_set_level')
         obj = self._enrich(message, 'error', objects, kwargs)
         self.logger.error(obj)
 
     def critical(self, message, *objects, **kwargs):
-        if kwargs.get('set_level'):
-            self.set_level(kwargs.get('set_level'))
-            kwargs.pop('set_level')
+        if kwargs.get('_set_level'):
+            self.set_level(kwargs.get('_set_level'))
+            kwargs.pop('_set_level')
         obj = self._enrich(message, 'critical', objects, kwargs)
         self.logger.critical(obj)