added a note about Maven Artifact API
diff --git a/src/site/apt/comparison.apt b/src/site/apt/comparison.apt
index d808afa..3b9c371 100644
--- a/src/site/apt/comparison.apt
+++ b/src/site/apt/comparison.apt
@@ -31,11 +31,11 @@
   Here's a small matrix which should help you choosing the right instance.

 

   In general:

-  

+

   * an Artifact holds a file mapped on a certain coordinate (GAV + classifier + extension),

-  

+

   * a {{{/ref/current/maven-model/maven.html#class_dependency}Dependency}} contains an artifact and has transitive information,

-  

+

   * a MavenProject holds a pom-file, an optional main file derived from the packaging, and can have attached files (= with classifier and extension), all using the same GAV.

 

   []

@@ -54,10 +54,13 @@
 | attached artifacts | no          | no             | yes           |

 *--------------------+-------------+----------------+---------------+

 

-This implies the following:

+  This implies the following:

 

-  * From dependency to artifact is possible, since you can map a type to an extension.

-    However, it is not possible to go from artifact back to dependency, there are several types which have jar as file extension.

-    

+  * From dependency to artifact is possible, since you can map a type to an extension (see {{{/ref/current/maven-core/artifact-handlers.html}default dependency types}}).

+    However, it is not possible to go from artifact back to dependency, there are several types which have jar as file extension for example.

+

   * There's no such thing as transitive artifacts. Filtering during resolution is based on DependencyFilters,

-    ArtifactFilters can only be applied afterwards, hence are less efficient.

+    ArtifactFilters can only be applied afterwards, hence are less powerful.

+

+  Notice that for historical reasons, Maven internal {{{/ref/current/maven-artifact/apidocs/org/apache/maven/artifact/Artifact.html}Artifact API}}

+  mixes dependency and artifact concepts.