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diff --git a/docs/thread/buffer.md b/docs/thread/buffer.md
index 65af0c0..fbd6678 100644
--- a/docs/thread/buffer.md
+++ b/docs/thread/buffer.md
@@ -36,6 +36,7 @@ copies the value in the buffer to the current state
buffer:set(V)
sets the value in the buffer
+returns the old value of the buffer
### buffer:mod