Documentation.

h2/src/main/org/h2/util/DateTimeUtils.java

@@ -37,7 +37,7 @@ public class DateTimeUtils {
      */
     public static final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000L;
 
-    public static final long NANOS_PER_DAY = MILLIS_PER_DAY * 1000000;
+    private static final long NANOS_PER_DAY = MILLIS_PER_DAY * 1000000;
 
     private static final int SHIFT_YEAR = 9;
     private static final int SHIFT_MONTH = 5;

h2/src/tools/org/h2/dev/fs/FilePathCrypt.java

@@ -112,8 +112,15 @@ public class FilePathCrypt extends FilePathWrapper {
  */
 class FileCrypt extends FileBase {
 
+    /**
+     * The length of the file header. Using a smaller header is possible, but
+     * might result in un-aligned reads and writes.
+     */
     static final int HEADER_LENGTH = 4096;
 
+    /**
+     * The block size.
+     */
     static final int BLOCK_SIZE = Constants.FILE_BLOCK_SIZE;
 
     // TODO improve the header