diff --git a/tutorial_particles_2d.md b/tutorial_particles_2d.md
index 3eab6c2..5963abf 100644
--- a/tutorial_particles_2d.md
+++ b/tutorial_particles_2d.md
@@ -40,3 +40,40 @@ This parameter is useful because, by rotating the node, gravity will also be rot
Spread is the angle at which particles will randomly be emitted. Increasing the spread will increase the angle. A spread of 180 will emit in all directions.
+
+#### Linear Velocity
+
+Linear Velocity is the speed at which particles will be emitted (in pixels/sec). Speed might later be modified by gravity or other acceleations (as described further below).
+
+
+
+
+#### Spin Velocity
+
+Spin Velocity is the speed at which particles turn around their center (in degrees/sec).
+
+
+
+#### Orbit Velocity
+
+Orbit Velocity is used to make particles turn around their center.
+
+
+
+#### Gravity Direction & Strength
+
+Gravity can be modified as in direction and strength. Gravity affects every particle currently alive.
+
+
+
+#### Radial Acceleration
+
+If this acceleration is positive, particles are accelerated away from the center. If negative, they are absorbed towards it.
+
+
+
+#### Tangential Acceleration
+
+This acceleration will use the tangent vector to the center. Combined with Radial Acceleration can do nice effects.
+
+