clarify what the red background means

1 files changed, 1 insertions, 1 deletions

diff --git a/check_checkers.py b/check_checkers.py
index 65d1eec..1a883b3 100755
--- a/check_checkers.py
+++ b/check_checkers.py
@@ -167,7 +167,7 @@ def run(
     out.write(
         '''<p>This page compares three static type checkers for Python.
     The <span class=unexpected>red</span> background indicates that the checker
-    outputs an incorrect result (either a false positive or a false negative).
+    fails to detect a type error or reports a false positive.
     <a href=/>Back to start page</a>.</p>'''
     )