diff --git a/src/main/groovy/org/groocss/Color.groovy b/src/main/groovy/org/groocss/Color.groovy
index 2ec037e..c403b18 100644
--- a/src/main/groovy/org/groocss/Color.groovy
+++ b/src/main/groovy/org/groocss/Color.groovy
@@ -21,6 +21,19 @@ import java.math.MathContext
 
 /**
  * Controls Color for CSS styles and has methods for brighter, darker, etc.
+ *
+ * <p>Colors can be created using many different methods:
+ * <li>{@link ColorMethods#rgb},
+ * <li>{@link ColorMethods#rgba}, <li>{@link ColorMethods#clr},
+ * <li>{@link ColorMethods#hsl}, <li>{@link ColorMethods#hsla},
+ * <li>or using {@link org.groocss.ext.StringExtension#getColor(java.lang.String)} or 'hex'.toColor(), among others.
+ *
+ * <p>The final CSS result from a Color depends on how it was created and what methods were called on it.
+ * For example, if {@link Color#alpha(double)} is used, the output color uses rgba.
+ *
+ * <p>Methods from {@link ColorMethods} are available to modify Colors.
+ *
+ * @see ColorMethods
  */
 @EqualsAndHashCode
 class Color {
diff --git a/src/main/groovy/org/groocss/Config.groovy b/src/main/groovy/org/groocss/Config.groovy
index 2a043c2..3ed7b24 100644
--- a/src/main/groovy/org/groocss/Config.groovy
+++ b/src/main/groovy/org/groocss/Config.groovy
@@ -22,7 +22,15 @@ import groovy.transform.builder.Builder
 import org.groocss.valid.Processor
 
 /**
- * Configuration for GrooCSS conversions.
+ * Configuration for GrooCSS conversions. There are at least four different ways to configure GrooCSS:
+ *
+ * <li>Using the groovy constructor: new Config(compress: true)
+ * <li>Using the builder syntax: Config.builder().compress(true).build()
+ * <li>Using the DSL: GrooCSS.withConfig { noExts().compress().utf8() }...
+ * <li>Using StringExtension with config use: 'main.css'.groocss(new Config()) { ... }.
+ *
+ * @see GrooCSS
+ * @see org.groocss.ext.StringExtension
  */
 @MapConstructor
 @Canonical
diff --git a/src/main/groovy/org/groocss/Measurement.groovy b/src/main/groovy/org/groocss/Measurement.groovy
index e66048f..8bb561d 100644
--- a/src/main/groovy/org/groocss/Measurement.groovy
+++ b/src/main/groovy/org/groocss/Measurement.groovy
@@ -20,11 +20,11 @@ import org.codehaus.groovy.util.HashCodeHelper
 
 /**
  * Represents some type of number value with a unit, such as 2 seconds or 20 pixels.
- *
+ * <p>
  * Measurements are created using the DSL syntax such as:
- * <code>2.s //== two seconds
+ * <PRE>2.s //== two seconds
  * 20.px //== 20 pixels
- * 20.deg //== 20 degrees</code>
+ * 20.deg //== 20 degrees</PRE>
  *
  * @see org.groocss.ext.NumberExtension
  * @see org.groocss.valid.DefaultValidator
diff --git a/src/main/groovy/org/groocss/PseudoClass.groovy b/src/main/groovy/org/groocss/PseudoClass.groovy
index e794f26..295a421 100644
--- a/src/main/groovy/org/groocss/PseudoClass.groovy
+++ b/src/main/groovy/org/groocss/PseudoClass.groovy
@@ -19,6 +19,13 @@ import groovy.transform.*
 
 /**
  * Represents a CSS pseudo-class such as :active, :focus, or :nthChild(odd).
+ * <p>
+ * Pseudo classes are appended to selectors using the % operator. They are chainable as well meaning
+ * the following is possible: <code>a %active %hover</code> becomes a:active:hover.
+ * <p>
+ * Special abbreviations exist such as "odd" for ":nthChild(odd)" and "even" for :nthChild(even).
+ *
+ * @see GrooCSS
  */
 @TypeChecked
 @TupleConstructor
diff --git a/src/main/groovy/org/groocss/Raw.groovy b/src/main/groovy/org/groocss/Raw.groovy
index dd0127d..e6bcbc7 100644
--- a/src/main/groovy/org/groocss/Raw.groovy
+++ b/src/main/groovy/org/groocss/Raw.groovy
@@ -20,7 +20,7 @@ import groovy.transform.EqualsAndHashCode
 import groovy.transform.TupleConstructor
 
 /**
- * Created by adavis on 8/9/17.
+ * Raw contains unescaped CSS that will be output in final CSS. Created by adavis on 8/9/17.
  */
 @TupleConstructor
 @EqualsAndHashCode
diff --git a/src/main/groovy/org/groocss/valid/AbstractValidator.groovy b/src/main/groovy/org/groocss/valid/AbstractValidator.groovy
index e08c371..c8378b0 100644
--- a/src/main/groovy/org/groocss/valid/AbstractValidator.groovy
+++ b/src/main/groovy/org/groocss/valid/AbstractValidator.groovy
@@ -1,6 +1,5 @@
 package org.groocss.valid
 
-import groovy.transform.AutoImplement
 import groovy.transform.CompileStatic
 import org.groocss.CSSPart
 
@@ -10,7 +9,6 @@ import org.groocss.CSSPart
  * @see Processor
  * @see DefaultValidator
  */
-@AutoImplement(exception = Processor.NotImplementedException)
 @CompileStatic
 abstract class AbstractValidator<T extends CSSPart> implements Processor<T> {
 
diff --git a/src/main/groovy/org/groocss/valid/DefaultValidator.groovy b/src/main/groovy/org/groocss/valid/DefaultValidator.groovy
index e11e47d..00e089e 100644
--- a/src/main/groovy/org/groocss/valid/DefaultValidator.groovy
+++ b/src/main/groovy/org/groocss/valid/DefaultValidator.groovy
@@ -21,6 +21,11 @@ import org.groocss.Style
 
 /**
  * Does default GrooCSS validation of Measurements.
+ * <p>Makes sure that time values are time Measurements and size values (such as top, left, width, and fontSize)
+ * are size values such as 1.px or 1.em or 10%.
+ *
+ * @see org.groocss.Config
+ * @see RequireMeasurements
  */
 @CompileStatic
 class DefaultValidator extends AbstractValidator<Style> implements Processor<Style> {
diff --git a/src/main/groovy/org/groocss/valid/Processor.groovy b/src/main/groovy/org/groocss/valid/Processor.groovy
index 798f81d..d8c6d49 100644
--- a/src/main/groovy/org/groocss/valid/Processor.groovy
+++ b/src/main/groovy/org/groocss/valid/Processor.groovy
@@ -3,14 +3,26 @@ package org.groocss.valid
 import groovy.transform.CompileStatic
 import org.groocss.CSSPart
 
-/** Interface for defining a custom Processor that can modify or validate GrooCSS input. */
+/**
+ * Interface for defining a custom Processor that can modify or validate GrooCSS input.
+ * <p>
+ * By extending this interface you can write your own custom validators and add them via {@link org.groocss.Config}.
+ * <p>
+ * You could also write your own Processor that modifies values in the PRE_VALIDATE phase or any other Phase.
+ * For example:<pre><code>
+ * class ConvertAllIntsToPixels implements Processor< Style > {
+ *     Optional<String> process(Style style, Phase phase) {
+ *         if (phase == Phase.PRE_VALIDATE && style.value instanceof Integer) {
+ *             style.value = new Measurement(style.value, 'px')
+ *         }
+ *         return Optional.empty();
+ *     }
+ * }     </code></pre>
+ * @see org.groocss.Config
+ * */
 @CompileStatic
 interface Processor<T extends CSSPart> {
 
-    /** Thrown for methods that are not implemented by the processor. */
-    class NotImplementedException extends RuntimeException {
-    }
-
     /** Enum of phases for which this Processor should be called. */
     enum Phase { PRE_VALIDATE, VALIDATE, POST_VALIDATE }
 
diff --git a/src/main/groovy/org/groocss/valid/RequireMeasurements.groovy b/src/main/groovy/org/groocss/valid/RequireMeasurements.groovy
index bc639cd..a610080 100644
--- a/src/main/groovy/org/groocss/valid/RequireMeasurements.groovy
+++ b/src/main/groovy/org/groocss/valid/RequireMeasurements.groovy
@@ -19,8 +19,15 @@ import groovy.transform.CompileStatic
 import org.groocss.Measurement
 import org.groocss.Style
 
-/** Validates that every value that can be a Measurement is one.
+/**
+ * Validates that every value that can be a Measurement is one. In conjunction with the
+ * {@link DefaultValidator} this has the effect of making sure that many values are correct.
+ * <p>
+ * You can write your own custom validators and add them via {@link org.groocss.Config}.
+ *
  * @see Measurement
+ * @see org.groocss.Config
+ * @see DefaultValidator
  */
 @CompileStatic
 class RequireMeasurements extends AbstractValidator<Style> implements Processor<Style> {