diff --git a/CHANGELOG.md b/CHANGELOG.md
index aece68b..6cf9795 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ All notable changes to this project will be documented in this file.
 
 
 ### Changed
+- Renamed `tri` Forth word to `triangle`.
 - Sequencer rewritten with prospective lookahead scheduling. Instead of sleeping until a substep, waking late, and detecting past events, the sequencer now pre-computes all events within a ~20ms forward window. Events arrive at doux with positive time deltas, scheduled before they need to fire. Sleep+spin-wait replaced by `recv_timeout(3ms)` on the command channel. Timing no longer depends on OS sleep precision.
 - `audio_sample_pos` updated at buffer start instead of end, so `engine_time` reflects current playback position.
 - Doux grace period increased from 1ms to 50ms as a safety net (events should never be late with lookahead).
diff --git a/crates/forth/src/ops.rs b/crates/forth/src/ops.rs
index 47cdba3..ef15b0c 100644
--- a/crates/forth/src/ops.rs
+++ b/crates/forth/src/ops.rs
@@ -80,7 +80,7 @@ pub enum Op {
     Ad,
     Apply,
     Ramp,
-    Tri,
+    Triangle,
     Range,
     Perlin,
     Chain,
diff --git a/crates/forth/src/vm.rs b/crates/forth/src/vm.rs
index cc66df3..57ae1c8 100644
--- a/crates/forth/src/vm.rs
+++ b/crates/forth/src/vm.rs
@@ -852,7 +852,7 @@ impl Forth {
                     let val = phase.powf(curve);
                     stack.push(Value::Float(val, None));
                 }
-                Op::Tri => {
+                Op::Triangle => {
                     let freq = stack.pop().ok_or("stack underflow")?.as_float()?;
                     let phase = (freq * ctx.beat).fract();
                     let phase = if phase < 0.0 { phase + 1.0 } else { phase };
diff --git a/crates/forth/src/words.rs b/crates/forth/src/words.rs
index 7e29158..3739220 100644
--- a/crates/forth/src/words.rs
+++ b/crates/forth/src/words.rs
@@ -1198,12 +1198,12 @@ pub const WORDS: &[Word] = &[
         varargs: false,
     },
     Word {
-        name: "tri",
+        name: "triangle",
         aliases: &[],
         category: "LFO",
         stack: "(freq -- val)",
         desc: "Triangle wave [0,1]: 0→1→0",
-        example: "0.5 tri",
+        example: "0.5 triangle",
         compile: Simple,
         varargs: false,
     },
@@ -2879,7 +2879,7 @@ pub(super) fn simple_op(name: &str) -> Option<Op> {
         "ad" => Op::Ad,
         "apply" => Op::Apply,
         "ramp" => Op::Ramp,
-        "tri" => Op::Tri,
+        "triangle" => Op::Triangle,
         "range" => Op::Range,
         "perlin" => Op::Perlin,
         "chain" => Op::Chain,