1 files changed, 6 insertions, 2 deletions
diff --git a/src/nvim/event/stream.h b/src/nvim/event/stream.h
index eaf4b010f5..c6baac0db7 100644
--- a/src/nvim/event/stream.h
+++ b/src/nvim/event/stream.h
@@ -14,10 +14,14 @@ typedef struct stream Stream;
 ///
 /// @param stream The Stream instance
 /// @param rbuffer The associated RBuffer instance
+/// @param count Number of bytes to read. This must be respected if keeping
+///              the order of events is a requirement. This is because events
+///              may be queued and only processed later when more data is copied
+///              into to the buffer, so one read may starve another.
 /// @param data User-defined data
 /// @param eof If the stream reached EOF.
-typedef void (*stream_read_cb)(Stream *stream, RBuffer *buf, void *data,
-    bool eof);
+typedef void (*stream_read_cb)(Stream *stream, RBuffer *buf, size_t count,
+    void *data, bool eof);
 
 /// Type of function called when the Stream has information about a write
 /// request.