diff --git a/profile/README.md b/profile/README.md
index 6592f25..1714734 100644
--- a/profile/README.md
+++ b/profile/README.md
@@ -6,7 +6,7 @@ We revive classic teaching simulations (Flash/Java → modern web), ship origina
 
 | | |
 | --- | --- |
-| **29** simulations | SceneryStack · TypeScript · Vite |
+| **30** simulations | SceneryStack · TypeScript · Vite |
 | **NAAP · PhET · original** | Astronomy labs, physics ports, and new work |
 | **Tools & hardware** | Docs, fleet automation, CD48, browser VPython |
 
@@ -52,6 +52,7 @@ Original OpenPhysics labs — optics, quantum circuits, resonance, motion analys
 | --- | --- | --- |
 | **[AC Phasor](https://github.com/OpenPhysics/ACPhasor)** | [Try it](https://openphysics.github.io/ACPhasor/) | RLC phasors, impedance, resonance, and AC power |
 | **[Carnot Heat Engine](https://github.com/OpenPhysics/CarnotHeatEngine)** | [Try it](https://openphysics.github.io/CarnotHeatEngine/) | Carnot cycle: PV/TS diagrams, efficiency, refrigerator & heat pump |
+| **[Crystal Lattice](https://github.com/OpenPhysics/CrystalLattice)** | [Try it](https://openphysics.github.io/CrystalLattice/) | Bravais lattices, cubic cells, close packing, Miller indices, quasicrystals |
 | **[Doppler Effect](https://github.com/OpenPhysics/DopplerEffect)** | [Try it](https://openphysics.github.io/DopplerEffect/) | Sound waves and relative motion |
 | **[Light Propagation](https://github.com/OpenPhysics/LightPropagation)** | [Try it](https://openphysics.github.io/LightPropagation/) | Polarizers and wave plates |
 | **[Optics Lab](https://github.com/OpenPhysics/OpticsLab)** | [Try it](https://openphysics.github.io/OpticsLab/) | Geometric optics and refraction |