diff --git a/RUN-A-NODE.md b/RUN-A-NODE.md
index aaf8456..2b65934 100644
--- a/RUN-A-NODE.md
+++ b/RUN-A-NODE.md
@@ -321,6 +321,7 @@ export BESU_OPTS="\
 -Daere.pq.chainId=2800 \
 -Daere.pq.hybridRegistry=$REG/hibrid-10.properties \
 -Daere.pq.schemeSchedule=17047568:falcon-512+slh-dsa-sha2-128s \
+-Daere.pqtx.forkBlock=19900000 \
 -Daere.pq.anchor.minSealsCeiling=1"
 ```
 
diff --git a/SPEC.md b/SPEC.md
index 0a0d087..e86f2f0 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -385,7 +385,8 @@ that it has nothing to report.
   The window is persisted under `<data-path>/aere-pq-seal-window` in segments of 64 heights (frame:
   `length(4 BE) || RLP[domain, chainId, height, hash, certificate] || crc32(4 BE)`), restored at
   startup only for frames whose hash is the node's own canonical hash at that height and whose
-  seals verify now; `-Daere.pq.finality.persist=false` disables the journal.
+  seals verify now; setting the system property `aere.pq.finality.persist` to `false` disables the
+  journal (any other value, or the property absent, keeps it on; source: `PqSealWindowStore`).
 - JSON-RPC method `aere_getPqFinality(blockParameter)` (QBFT method set; `blockParameter` is a hex
   quantity or `latest`) returns, for a block in the window: `blockNumber`, `blockHash`, `quorum`
   (ceil(2N/3) of the validator set at that height), `falconSealsHeard`, `falconSealsVerified` (each
@@ -491,6 +492,7 @@ passes"):
 -Daere.pq.chainId=2800
 -Daere.pq.hybridRegistry=<registries>/hibrid-10.properties
 -Daere.pq.schemeSchedule=17047568:falcon-512+slh-dsa-sha2-128s
+-Daere.pqtx.forkBlock=19900000
 -Daere.pq.anchor.minSealsCeiling=1
 ```