diff --git a/tsdb/docs/format/wal.md b/tsdb/docs/format/wal.md
index 2d55c441b..7714b4fa2 100644
--- a/tsdb/docs/format/wal.md
+++ b/tsdb/docs/format/wal.md
@@ -99,7 +99,7 @@ See: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/Op
 
 ```
 ┌──────────────────────────────────────────────────────────────────┐
-│ type = 5 <1b>                                                    │
+│ type = 4 <1b>                                                    │
 ├──────────────────────────────────────────────────────────────────┤
 │ ┌────────────────────┬───────────────────────────┐               │
 │ │ id <8b>            │ timestamp <8b>            │               │