diff --git a/bson/binary.py b/bson/binary.py
index dd12f56e2..50cfbd843 100644
--- a/bson/binary.py
+++ b/bson/binary.py
@@ -169,6 +169,12 @@ MD5_SUBTYPE = 5
 """BSON binary subtype for an MD5 hash.
 """
 
+COLUMN_SUBTYPE = 7
+"""BSON binary subtype for columns.
+
+.. versionadded:: 4.0
+"""
+
 USER_DEFINED_SUBTYPE = 128
 """BSON binary subtype for any user defined structure.
 """
diff --git a/doc/api/bson/binary.rst b/doc/api/bson/binary.rst
index a754d43d5..b9673d70d 100644
--- a/doc/api/bson/binary.rst
+++ b/doc/api/bson/binary.rst
@@ -14,6 +14,7 @@
    .. autodata:: JAVA_LEGACY
    .. autodata:: CSHARP_LEGACY
    .. autodata:: MD5_SUBTYPE
+   .. autodata:: COLUMN_SUBTYPE
    .. autodata:: USER_DEFINED_SUBTYPE
 
    .. autoclass:: UuidRepresentation