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-rw-r--r--src/api/buffer.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/api/buffer.h b/src/api/buffer.h
index 516df04ae4..6c72a9f099 100644
--- a/src/api/buffer.h
+++ b/src/api/buffer.h
@@ -84,7 +84,8 @@ Object buffer_get_var(Buffer buffer, String name, Error *err);
/// @param name The variable name
/// @param value The variable value
/// @param[out] err Details of an error that may have occurred
-void buffer_set_var(Buffer buffer, String name, Object value, Error *err);
+/// @return The old value
+Object buffer_set_var(Buffer buffer, String name, Object value, Error *err);
/// Gets a buffer option value
///