diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst
index ad8ef5dfc76..aed4f38ba29 100644
--- a/Doc/library/dis.rst
+++ b/Doc/library/dis.rst
@@ -957,7 +957,8 @@ iterations of the loop.
 
 .. opcode:: GET_LEN
 
-   Perform ``STACK.append(len(STACK[-1]))``.
+   Perform ``STACK.append(len(STACK[-1]))``. Used in :keyword:`match` statements where
+   comparison with structure of pattern is needed.
 
    .. versionadded:: 3.10