diff --git a/src/main/java/com/android/tools/r8/PrintSeeds.java b/src/main/java/com/android/tools/r8/PrintSeeds.java
index b1bc7ca..782c91d 100644
--- a/src/main/java/com/android/tools/r8/PrintSeeds.java
+++ b/src/main/java/com/android/tools/r8/PrintSeeds.java
@@ -20,17 +20,32 @@
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 
+/**
+ * PrintSeeds prints the classes, interfaces, methods and fields selected by a given ProGuard
+ * configuration &lt;pg-conf.txt&gt; when compiling a given program &lt;r8.jar&gt; alongside a given
+ * library &lt;rt.jar&gt;.
+ *
+ * <p>The output format is identical to what is printed when {@code -printseeds} is specified in
+ * &lt;pg-conf.txt&gt;, but running PrintSeeds can be faster than running R8 with {@code
+ * -printseeds}. See also the {@link PrintUses} program in R8.
+ */
 public class PrintSeeds {
 
   private static final String USAGE =
       "Arguments: <rt.jar> <r8.jar> <pg-conf.txt>\n"
           + "\n"
           + "PrintSeeds prints the classes, interfaces, methods and fields selected by\n"
-          + "<pg-conf.txt> when compiling <r8.jar> alongside <rt.jar>.";
+          + "<pg-conf.txt> when compiling <r8.jar> alongside <rt.jar>.\n"
+          + "\n"
+          + "The output format is identical to what is printed when -printseeds is specified in\n"
+          + "<pg-conf.txt>, but running PrintSeeds can be faster than running R8 with \n"
+          + "-printseeds. See also the "
+          + PrintUses.class.getSimpleName()
+          + " program in R8.";
 
   public static void main(String[] args) throws Exception {
     if (args.length != 3) {
-      System.out.println(USAGE);
+      System.out.println(USAGE.replace("\n", System.lineSeparator()));
       System.exit(1);
     }
     Path rtJar = Paths.get(args[0]);
diff --git a/src/main/java/com/android/tools/r8/PrintUses.java b/src/main/java/com/android/tools/r8/PrintUses.java
index 0e69de6..c762182 100644
--- a/src/main/java/com/android/tools/r8/PrintUses.java
+++ b/src/main/java/com/android/tools/r8/PrintUses.java
@@ -31,6 +31,17 @@
 import java.util.Map;
 import java.util.Set;
 
+/**
+ * PrintUses prints the classes, interfaces, methods and fields used by a given program
+ * &lt;sample.jar&gt;, restricted to classes and interfaces in a given library &lt;r8.jar&gt; that
+ * are not in &lt;sample.jar&gt;.
+ *
+ * <p>The output is in the same format as what is printed when specifying {@code -printseeds} in a
+ * ProGuard configuration file. See also the {@link PrintSeeds} program in R8.
+ *
+ * <p>Note that this tool is not related to the {@code -printusage} option of ProGuard configuration
+ * files.
+ */
 public class PrintUses {
 
   private static final String USAGE =
@@ -38,7 +49,12 @@
           + "\n"
           + "PrintUses prints the classes, interfaces, methods and fields used by <sample.jar>,\n"
           + "restricted to classes and interfaces in <r8.jar> that are not in <sample.jar>.\n"
-          + "<rt.jar> and <r8.jar> should point to libraries used by <sample.jar>.";
+          + "<rt.jar> and <r8.jar> should point to libraries used by <sample.jar>.\n"
+          + "\n"
+          + "The output is in the same format as what is printed when specifying -printseeds in\n"
+          + "a ProGuard configuration file. See also the "
+          + PrintSeeds.class.getSimpleName()
+          + " program in R8.";
 
   private final Set<String> descriptors;
   private final PrintStream out;
@@ -191,7 +207,7 @@
 
   public static void main(String[] args) throws Exception {
     if (args.length != 3) {
-      System.out.println(USAGE);
+      System.out.println(USAGE.replace("\n", System.lineSeparator()));
       return;
     }
     AndroidApp.Builder builder = AndroidApp.builder();