docs: A new --genesis-override CLI flag was added to the apply command, allowing developers to set genesis parameters (e.g. staking unbonding time, gov voting period) when deploying a node with --preset genesis-chain. (sei-protocol/seictl#184)

node/apply-command.md

@@ -0,0 +1,24 @@
+## `--genesis-override`
+
+**Flag:** `--genesis-override <module.field[.field...]>=<value>`  
+**Type:** string (repeatable)  
+**Valid with:** `--preset genesis-chain` only
+
+Overrides genesis parameters when deploying a node with `--preset genesis-chain`. Keys use dotted Cosmos module paths; values are parsed as JSON when valid (numbers, booleans, objects, arrays, quoted strings), or stored as raw strings otherwise.
+
+```bash
+seid apply \
+  --preset genesis-chain \
+  --genesis-override staking.params.unbonding_time=600s \
+  --genesis-override gov.params.voting_period=300s
+```
+
+To force a numeric-looking value to be treated as a string, wrap it in JSON quotes:
+
+```bash
+--genesis-override foo.bar='"42"'
+```
+
+> **Note:** Using `--genesis-override` with any preset other than `genesis-chain` returns an error.
+
+<!-- TODO: expand with full list of supported module paths and link to genesis config reference -->