diff --git a/docs/known-issues.md b/docs/known-issues.md
index 25d0960..a178d47 100644
--- a/docs/known-issues.md
+++ b/docs/known-issues.md
@@ -98,10 +98,12 @@ Measured 2026-09-26 on tank with `cargo test -p clawhdf5-tools --test
 edit_interop -- --ignored --nocapture measure_append_waste` (one editor for
 the whole workload; file sizes are deterministic): 1000 appends of 100 `f8`
 values to a 1-D dataset with 1024-element chunks give 810 504 bytes
-unfiltered, as libhdf5's file, and 306 780 bytes with gzip (307 210 before
-reuse; libhdf5: 306 058; `h5repack`: 306 104); 2000 appends of 10 values
-with 4096-element gzip chunks give 79 829 bytes (119 684 before reuse)
-against libhdf5's 50 292 (`h5repack`: 49 930): the chunk being appended to
+unfiltered, as libhdf5's file (`h5repack` of either: 810 360), and 306 780
+bytes with gzip (307 210 before reuse; libhdf5's file: 306 058; `h5repack`
+of the editor's file: 306 104, of libhdf5's: 305 954); 2000 appends of 10
+values with 4096-element gzip chunks give 79 829 bytes (119 684 before
+reuse) against libhdf5's 50 292 (`h5repack` of the editor's file: 49 930,
+of libhdf5's: 50 188): the chunk being appended to
 is followed by new index blocks and moves each time it grows, and the
 space it leaves is too small for its next, larger version.