Index: src/pager.c
==================================================================
--- src/pager.c
+++ src/pager.c
@@ -3458,11 +3458,11 @@
 ** Adjust settings of the pager to those specified in the pgFlags parameter.
 **
 ** The "level" in pgFlags & PAGER_SYNCHRONOUS_MASK sets the robustness
 ** of the database to damage due to OS crashes or power failures by
 ** changing the number of syncs()s when writing the journals.
-** There are three levels:
+** There are four levels:
 **
 **    OFF       sqlite3OsSync() is never called.  This is the default
 **              for temporary and transient files.
 **
 **    NORMAL    The journal is synced once before writes begin on the
@@ -3477,19 +3477,24 @@
 **              of the journal header - being written in between the two
 **              syncs).  If we assume that writing a
 **              single disk sector is atomic, then this mode provides
 **              assurance that the journal will not be corrupted to the
 **              point of causing damage to the database during rollback.
+**
+**    EXTRA     This is like FULL except that is also syncs the directory
+**              that contains the rollback journal after the rollback
+**              journal is unlinked.
 **
 ** The above is for a rollback-journal mode.  For WAL mode, OFF continues
 ** to mean that no syncs ever occur.  NORMAL means that the WAL is synced
 ** prior to the start of checkpoint and that the database file is synced
 ** at the conclusion of the checkpoint if the entire content of the WAL
 ** was written back into the database.  But no sync operations occur for
 ** an ordinary commit in NORMAL mode with WAL.  FULL means that the WAL
 ** file is synced following each commit operation, in addition to the
-** syncs associated with NORMAL.
+** syncs associated with NORMAL.  There is no difference between FULL
+** and EXTRA for WAL mode.
 **
 ** Do not confuse synchronous=FULL with SQLITE_SYNC_FULL.  The
 ** SQLITE_SYNC_FULL macro means to use the MacOSX-style full-fsync
 ** using fcntl(F_FULLFSYNC).  SQLITE_SYNC_NORMAL means to do an
 ** ordinary fsync() call.  There is no difference between SQLITE_SYNC_FULL