diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index 307bc7e188b..fb497f28d46 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -462,6 +462,11 @@ form.
       about compiling regular expressions.
 
 
+.. data:: DEBUG
+
+   Display debug information about compiled expression.
+
+
 .. data:: I
           IGNORECASE