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-rw-r--r--Documentation/networking/filter.rst4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/networking/filter.rst b/Documentation/networking/filter.rst
index b3f457802836..251c6bd73d15 100644
--- a/Documentation/networking/filter.rst
+++ b/Documentation/networking/filter.rst
@@ -1076,8 +1076,8 @@ off``. ::
BPF_CMPXCHG
This atomically compares the value addressed by ``dst_reg + off`` with
-``R0``. If they match it is replaced with ``src_reg``, The value that was there
-before is loaded back to ``R0``.
+``R0``. If they match it is replaced with ``src_reg``. In either case, the
+value that was there before is zero-extended and loaded back to ``R0``.
Note that 1 and 2 byte atomic operations are not supported.