diff --git a/phew/logging.py b/phew/logging.py
index 70de24f..e52b959 100644
--- a/phew/logging.py
+++ b/phew/logging.py
@@ -4,11 +4,16 @@ def datetime_string():
   dt = machine.RTC().datetime()
   return "{0:04d}-{1:02d}-{2:02d} {4:02d}:{5:02d}:{6:02d}".format(*dt)
 
+_log_file = "log.txt"
+def log_file(file):
+  global _log_file
+  _log_file = file
+
 def log(level, text):
   datetime = datetime_string()
   log_entry = "{0} [{1:8} /{2:>8}] {3}".format(datetime, level, gc.mem_free(), text)
   print(log_entry)
-  with open("log.txt", "a") as logfile:
+  with open(_log_file, "a") as logfile:
     logfile.write(log_entry + '\n')
 
 def info(*items):