diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst
index e654760fb91c65..1cee5a3befdacc 100644
--- a/Doc/library/dis.rst
+++ b/Doc/library/dis.rst
@@ -956,7 +956,8 @@ 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