diff --git a/README.md b/README.md
index 4c3fad34..6af34d49 100644
--- a/README.md
+++ b/README.md
@@ -56,21 +56,91 @@ Specify an options object with `name: 'euler'` to run the layout.  All other fie
 let defaults = {
   name: 'euler',
 
-  animate: true, // whether to show the layout as it's running; special 'end' value makes the layout animate like a discrete layout
-  refresh: 10, // number of ticks per frame; higher is faster but more jerky
-  maxIterations: 1000, // max iterations before the layout will bail out
-  maxSimulationTime: 4000, // max length in ms to run the layout
-  ungrabifyWhileSimulating: false, // so you can't drag nodes during layout
-  fit: true, // on every layout reposition of nodes, fit the viewport
-  padding: 30, // padding around the simulation
-  boundingBox: undefined, // constrain layout bounds; { x1, y1, x2, y2 } or { x1, y1, w, h }
-
-  // layout event callbacks
+  // The ideal legth of a spring
+  // - This acts as a hint for the edge length
+  // - The edge length can be longer or shorter if the forces are set to extreme values
+  springLength: edge => 80,
+
+  // Hooke's law coefficient
+  // - The value ranges on [0, 1]
+  // - Lower values give looser springs
+  // - Higher values give tighter springs
+  springCoeff: edge => 0.0008,
+
+  // The mass of the node in the physics simulation
+  // - The mass affects the gravity node repulsion/attraction
+  mass: node => 4,
+
+  // Coulomb's law coefficient
+  // - Makes the nodes repel each other for negative values
+  // - Makes the nodes attract each other for positive values
+  gravity: -1.2,
+
+  // Theta coefficient from Barnes-Hut simulation
+  // - Value ranges on [0, 1]
+  // - Performance is better with smaller values
+  // - Very small values may not create enough force to give a good result
+  theta: 0.666,
+
+  // Friction / drag coefficient to make the system stabilise over time
+  dragCoeff: 0.02,
+
+  // When the total of the squared position deltas is less than this value, the simulation ends
+  movementThreshold: 1,
+
+  // The amount of time passed per tick
+  // - Larger values result in faster runtimes but might spread things out too far
+  // - Smaller values produce more accurate results
+  timeStep: 20,
+
+  // The number of ticks per frame for animate:true
+  // - A larger value reduces rendering cost but can be jerky
+  // - A smaller value increases rendering cost but is smoother
+  refresh: 10,
+
+  // Whether to animate the layout
+  // - true : Animate while the layout is running
+  // - false : Just show the end result
+  // - 'end' : Animate directly to the end result
+  animate: true,
+
+  // Animation duration used for animate:'end'
+  animationDuration: undefined,
+
+  // Easing for animate:'end'
+  animationEasing: undefined,
+
+  // Maximum iterations and time (in ms) before the layout will bail out
+  // - A large value may allow for a better result
+  // - A small value may make the layout end prematurely
+  // - The layout may stop before this if it has settled
+  maxIterations: 1000,
+  maxSimulationTime: 4000,
+
+  // Prevent the user grabbing nodes during the layout (usually with animate:true)
+  ungrabifyWhileSimulating: false,
+
+  // Whether to fit the viewport to the repositioned graph
+  // true : Fits at end of layout for animate:false or animate:'end'; fits on each frame for animate:true
+  fit: true,
+
+  // Padding in rendered co-ordinates around the layout
+  padding: 30,
+
+  // Constrain layout bounds with one of
+  // - { x1, y1, x2, y2 }
+  // - { x1, y1, w, h }
+  // - undefined / null : Unconstrained
+  boundingBox: undefined,
+
+  // Layout event callbacks; equivalent to `layout.one('layoutready', callback)` for example
   ready: function(){}, // on layoutready
   stop: function(){}, // on layoutstop
 
-  // positioning options
-  randomize: false // use random node positions at beginning of layout
+  // Whether to randomize the initial positions of the nodes
+  // true : Use random positions within the bounding box
+  // false : Use the current node positions as the initial positions
+  randomize: false
 };
 
 cy.layout( defaults ).run();
diff --git a/src/euler/defaults.js b/src/euler/defaults.js
index c96338ca..c2a99e8f 100644
--- a/src/euler/defaults.js
+++ b/src/euler/defaults.js
@@ -1,4 +1,3 @@
-// TODO default euler-specific options
 const defaults = Object.freeze({
   // The ideal legth of a spring
   // - This acts as a hint for the edge length