Closes #20872: dbm/gdbm/ndbm close methods are not documented
diff --git a/Doc/library/gdbm.rst b/Doc/library/gdbm.rst
index 742c035..f36bb28 100644
--- a/Doc/library/gdbm.rst
+++ b/Doc/library/gdbm.rst
@@ -116,6 +116,11 @@
    unwritten data to be written to the disk.
 
 
+.. function:: close()
+
+   Close the ``gdbm`` database.
+
+
 .. seealso::
 
    Module :mod:`anydbm`