diff --git a/src/debug.py b/src/debug.py
index 9ddf1231d..0cc739d2d 100644
--- a/src/debug.py
+++ b/src/debug.py
@@ -149,6 +149,7 @@ def recoverableError(msg):
     _errorfd.flush()
 
 def unrecoverableError(msg):
+    """Logs some error message and then exits."""
     recoverableError(msg)
     exit(-1)