diff --git a/etc/getdown.pro b/etc/getdown.pro
index 8108e77..a8fb173 100644
--- a/etc/getdown.pro
+++ b/etc/getdown.pro
@@ -9,6 +9,7 @@
 -injars lib/jRegistryKey.jar(!META-INF/*)
 -injars lib/samskivert.jar(!META-INF/*,!**/velocity/**,!**/xml/**)
 -injars lib/commons-io.jar(!META-INF/*)
+-injars lib/snark.jar(!META-INF/*)
 
 -libraryjars <java.home>/lib/rt.jar
 -dontskipnonpubliclibraryclasses
diff --git a/lib/LIBS b/lib/LIBS
index c4a2782..ff566c1 100644
--- a/lib/LIBS
+++ b/lib/LIBS
@@ -2,3 +2,4 @@ samskivert.jar
 ant.jar
 commons-io.jar
 javaws.jar
+snark.jar
diff --git a/src/java/com/threerings/getdown/launcher/Downloader.java b/src/java/com/threerings/getdown/launcher/Downloader.java
index 31f3ee4..401eec7 100644
--- a/src/java/com/threerings/getdown/launcher/Downloader.java
+++ b/src/java/com/threerings/getdown/launcher/Downloader.java
@@ -141,6 +141,9 @@ public abstract class Downloader extends Thread
         _totalSize += checkSize(rsrc);
     }
 
+    /**
+     * Performs the protocol-specific portion of checking download size.
+     */
     protected abstract long checkSize (Resource rsrc) throws IOException;
 
     /**
@@ -162,6 +165,10 @@ public abstract class Downloader extends Thread
         doDownload(rsrc);
     }
 
+    /**
+     * Periodically called by the protocol-specific downloaders
+     * to update their progress.
+     */
     protected void updateObserver ()
     {
         // notify the observer if it's been sufficiently long
@@ -192,7 +199,7 @@ public abstract class Downloader extends Thread
 
     /**
      * Accomplishes the copying of the resource from remote location to
-     * local location using transport-specific code
+     * local location using protocol-specific code
      */
     protected abstract void doDownload (Resource rsrc) throws IOException;
 
diff --git a/src/java/com/threerings/getdown/launcher/HTTPDownloader.java b/src/java/com/threerings/getdown/launcher/HTTPDownloader.java
index e47d056..ae6986f 100644
--- a/src/java/com/threerings/getdown/launcher/HTTPDownloader.java
+++ b/src/java/com/threerings/getdown/launcher/HTTPDownloader.java
@@ -10,6 +10,9 @@ import com.samskivert.io.StreamUtil;
 import com.threerings.getdown.Log;
 import com.threerings.getdown.data.Resource;
 
+/**
+ * Implements downloading files over HTTP
+ */
 public class HTTPDownloader extends Downloader
 {
     public HTTPDownloader (List<Resource> resources, Observer obs)
@@ -40,6 +43,7 @@ public class HTTPDownloader extends Downloader
         return ucon.getContentLength();
     }
 
+    // documentation inherited
     protected void doDownload (Resource rsrc)
         throws IOException
     {
diff --git a/src/java/com/threerings/getdown/launcher/TorrentDownloader.java b/src/java/com/threerings/getdown/launcher/TorrentDownloader.java
index b090a62..0b7920f 100644
--- a/src/java/com/threerings/getdown/launcher/TorrentDownloader.java
+++ b/src/java/com/threerings/getdown/launcher/TorrentDownloader.java
@@ -10,6 +10,9 @@ import org.klomp.snark.SnarkShutdown;
 import com.threerings.getdown.Log;
 import com.threerings.getdown.data.Resource;
 
+/**
+ * Implements downloading data using BitTorrent
+ */
 public class TorrentDownloader extends Downloader
 {
     public TorrentDownloader (List<Resource> resources, Observer obs)
@@ -24,7 +27,7 @@ public class TorrentDownloader extends Downloader
         }
     }
 
-    @Override
+    // documentation inherited
     protected long checkSize(Resource rsrc)
         throws IOException
     {
@@ -44,7 +47,7 @@ public class TorrentDownloader extends Downloader
         return length;
     }
 
-    @Override
+    // documentation inherited
     protected void doDownload(Resource rsrc)
         throws IOException
     {
@@ -75,9 +78,19 @@ public class TorrentDownloader extends Downloader
         snark.shutdown();
     }
 
+    /** Keeps a mapping of resource names to torrent downloaders */
     protected HashMap<Resource, Snark> _torrentmap =
         new HashMap<Resource, Snark>();
+
+    /** If we fail, revert to using this HTTP download transport */
     protected HTTPDownloader _fallback = null;
+
+    /** The length of time before we check for adequate progress*/
     protected static final long TIME_THRESHOLD = 60 * 1000l;
+
+    /**
+     * The minimum amount of data that must be downloaded within the
+     * initial period in order to continue using BitTorrent
+     */
     protected static final long SIZE_THRESHOLD = 4000l;
 }