diff --git a/src/lang/date.js b/src/lang/date.js
index f0c67d1..116d6b5 100644
--- a/src/lang/date.js
+++ b/src/lang/date.js
@@ -5,7 +5,8 @@
 /**
  *  Date#toJSON -> String
  *  
- *  TODO: Date#toJSON
+ *  Produces a string representation of the date in ISO 8601 format.
+ *  
 **/
 Date.prototype.toJSON = function() {
   return '"' + this.getUTCFullYear() + '-' +
diff --git a/src/lang/enumerable.js b/src/lang/enumerable.js
index 3cb908c..34d25c4 100644
--- a/src/lang/enumerable.js
+++ b/src/lang/enumerable.js
@@ -29,8 +29,10 @@ var Enumerable = (function() {
   /**
    *  Enumerable#eachSlice(number[, iterator = Prototype.K[, context]]) -> Enumerable
    *
-   *  TODO: Enumerable#eachSlice
-   *  http://prototypejs.org/api/enumerable#method-eachslice
+   *  Groups items into chunks of the given size.
+   *  The final "slice" may have fewer than `number` items; it won't "pad" the
+   *  last group with empty values. For that behavior, use
+   *  [[Enumerable#inGroupsOf]].
   **/
   function eachSlice(number, iterator, context) {
     var index = -number, slices = [], array = this.toArray();
@@ -343,7 +345,7 @@ var Enumerable = (function() {
   /** related to: Object.inspect
    *  Enumerable#inspect() -> String
    *
-   *  TODO: Enumerable#inspect
+   *  Returns the debug-oriented string representation of the object.
   **/
   function inspect() {
     return '#<Enumerable:' + this.toArray().inspect() + '>';
diff --git a/src/lang/hash.js b/src/lang/hash.js
index 0a275b0..39a87be 100644
--- a/src/lang/hash.js
+++ b/src/lang/hash.js
@@ -16,7 +16,8 @@ var Hash = Class.create(Enumerable, (function() {
   /**
    *  new Hash([object])
    *
-   *  TODO: new Hash
+   *  Creates a new `Hash`. If `object` is given, the new hash will be populated
+   *  with all the object's properties. See [[$H]].
    **/
   function initialize(object) {
     this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
@@ -92,7 +93,8 @@ var Hash = Class.create(Enumerable, (function() {
   /**
    *  Hash#index(value) -> String
    *  
-   *  TODO: Hash#index
+   *  Returns the first key in the hash whose value matches `value`.
+   *  Returns `false` if there is no such key.
   **/
   function index(value) {
     var match = this.detect(function(pair) { 
@@ -104,9 +106,9 @@ var Hash = Class.create(Enumerable, (function() {
   /**
    *  Hash#merge(object) -> Hash
    *
-   *  Merges `object` to hash and returns the result of that merge. 
-   *  Prior to v1.6.0: This was destructive (object's values were added to hash).
-   *  Since v1.6.0: This is no longer destructive (hash is cloned before the operation).
+   *  Returns a new hash with `object`'s key/value pairs merged in.
+   *  To modify the original hash in place, use [[Hash#update]].
+   *  
   **/
   function merge(object) {
     return this.clone().update(object);
@@ -116,7 +118,8 @@ var Hash = Class.create(Enumerable, (function() {
    *  Hash#update(object) -> Hash
    *
    *  Updates hash with the key/value pairs of `object`.
-   *  The original hash will be modified.
+   *  The original hash will be modified. To return a new hash instead, use
+   *  [[Hash#merge]].
   **/
   function update(object) {
     return new Hash(object).inject(this, function(result, pair) {
@@ -125,11 +128,7 @@ var Hash = Class.create(Enumerable, (function() {
     });
   }
 
-  /**
-   *  Hash#toQueryPair(key, value) -> String
-   *  
-   *  TODO: Hash#toQueryPair
-  **/
+  // Private. No PDoc necessary.
   function toQueryPair(key, value) {
     if (Object.isUndefined(value)) return key;
     return key + '=' + encodeURIComponent(String.interpret(value));
@@ -173,7 +172,7 @@ var Hash = Class.create(Enumerable, (function() {
   }
 
   /**
-   *  Hash#clone() -> newHash
+   *  Hash#clone() -> Hash
    *
    *  Returns a clone of hash.
   **/
diff --git a/src/lang/number.js b/src/lang/number.js
index 6d3c780..c0ebf08 100644
--- a/src/lang/number.js
+++ b/src/lang/number.js
@@ -26,7 +26,9 @@ Object.extend(Number.prototype, (function() {
   /**
    *  Number#times(iterator) -> Number
    *
-   *  Encapsulates a regular [0..n[ loop, Ruby-style.
+   *  Calls `iterator` the specified number of times.
+   *  The function takes an integer as the first parameter; it will start at 0
+   *  and be incremented after each invocation.
   **/
   function times(iterator, context) {
     $R(0, this, true).each(iterator, context);
@@ -48,7 +50,7 @@ Object.extend(Number.prototype, (function() {
   /** related to: Object.toJSON
    *  Number#toJSON() -> String
    *
-   *  Returns a JSON string.
+   *  Returns a JSON string representation of the number.
   **/
   function toJSON() {
     return isFinite(this) ? this.toString() : 'null';