diff --git a/CLAUDE.md b/CLAUDE.md
index 44e65f5..8a55137 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -55,3 +55,4 @@ Repo: https://gitea.apointless.space/bsncubed/aes67-ESP32-P4
 
 ## Phase 2 (parked)
 - [ ] VLAN split: AES67 untagged + internet tagged (inet.vlan_id/pcp), per aes67-core-base.md "Network". Needs a tagged VLAN with DHCP on the switch port. Config group `inet` and the UI fields exist already; nothing is applied yet.
+- [ ] NTP (SNTP): servers as hostnames or IPs (e.g. `pool.ntp.org`, several allowed; names resolved via DNS, re-resolved on failure). Uses: seed the PTP clock with real time before becoming GM (today it starts at 1970), syslog timestamps. Needs a `time` config group + UI fields (change doc and page together).
diff --git a/docs/aes67-core-base.md b/docs/aes67-core-base.md
index 6357450..c22a460 100644
--- a/docs/aes67-core-base.md
+++ b/docs/aes67-core-base.md
@@ -110,6 +110,12 @@ When this device is the GM, offset/frequency/delay show "–".
 - LLDP (IEEE 802.1AB), transmit only, own code (not in IDF/lwIP): every 30 s, TTL 120 s, plus immediately on a new IP or hostname. TLVs: chassis ID and port ID = MAC, port description "eth0", system name = net.hostname, system description = project + firmware version, capabilities station-only, management address = IPv4. With the VLAN split, send it on the AES67 (untagged) side; the 802.1 port VLAN ID TLV can be added then.
 - Switch port: AES67 as native/untagged VLAN, internet tagged, PoE on. IGMP snooping + querier on the AES67 VLAN.
 
+## Time / NTP (phase 2, not implemented yet)
+- SNTP client for wall-clock time. Servers configurable as hostnames or IPs (e.g. `pool.ntp.org`, `0.pool.ntp.org`, a local server); several allowed, tried in order; names resolved via DNS and re-resolved when a server stops answering.
+- Uses: set the EMAC PTP clock to real time (TAI = UTC + 37 s) before this device becomes GM when it has not learned time from another GM (without NTP it starts at 1970); RFC 5424/3164 syslog timestamps.
+- Never step the PTP clock from NTP while locked to a GM or while GM with receivers locked; only seed it before becoming GM.
+- Planned config group: time: {ntp, servers[] or a comma-separated string, sync_interval_s}; the UI needs matching fields.
+
 ## Syslog
 - esp_log vprintf hook (chains to UART) -> queue -> low-priority UDP task. Non-blocking, drop and count on overflow, no recursion. RFC 5424 or 3164, PRI = facility*8 + severity (E3 W4 I6 D7 V7). Strip ANSI colour codes. HOSTNAME = net.hostname, APP-NAME = log tag.
 - Buffer early boot logs in the queue until the netif has an IP. POST /api/log/test sends one info-level message.