diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index 7232cded1b4..d3d97c02c45 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -498,6 +498,11 @@ form.
    isn't allowed for bytes).
 
 
+.. data:: DEBUG
+
+   Display debug information about compiled expression.
+
+
 .. data:: I
           IGNORECASE