diff --git a/AUTHORS b/AUTHORS
index 791ad574a..0176697bc 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -321,3 +321,4 @@ suggestions:
   Martin Strunz
   Kai HTML
   Marc Richter
+  rjc
diff --git a/ChangeLog b/ChangeLog
index 9ae14736d..78d6b136b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -63,6 +63,8 @@
           (thanks to Dan Callahan).
 - TW-1903 grammar error -- There are 1 local changes.
           (thanks to Eric Hymowitz).
+- TW-1906/#1919 sync sub-command is missing from task(1) manual page
+          (thanks to rjc).
 - TW-1910 unreachable statement
           (thanks to Martin Strunz).
 - TW-1930 Typo in help
diff --git a/doc/man/task.1.in b/doc/man/task.1.in
index 520192832..f883a548f 100644
--- a/doc/man/task.1.in
+++ b/doc/man/task.1.in
@@ -529,6 +529,25 @@ Shows statistics of the tasks defined by the filter.
 .B task <filter> summary
 Shows a report of aggregated task status by project.
 
+.TP
+.B task sync [init]
+The sync command synchronizes data with the Taskserver, if configured.
+
+The init subcommand should only ever be run once, and only on one client, because
+it sends all data to the Taskserver. This allows all the subsequent sync commands
+to only send small deltas.
+
+Note: If you use multiple sync clients, make sure this setting (which is the default)
+is on your primary client:
+
+  recurrence=on
+
+and on all other clients (this is not the default):
+
+  recurrence=off
+
+This is a workaround to avoid a recurrence bug that duplicates recurring tasks.
+
 .TP
 .B task <filter> tags
 Show a list of all tags used. Any special tags used are highlighted. Note that