diff --git a/README.md b/README.md
index 9880d4f9e..0935a9825 100644
--- a/README.md
+++ b/README.md
@@ -80,11 +80,10 @@ MD5SUM.  Doesn't delete files from the destination.
 
     rclone sync source:path dest:path
 
-Sync the source to the destination.  Doesn't transfer
-unchanged files, testing first by modification time then by
-size.  Deletes any files that exist in source that don't
-exist in destination. Since this can cause data loss, test
-first with the `--dry-run` flag.
+Sync the source to the destination, changing the destination only.  Doesn't
+transfer unchanged files, testing first by modification time then by size.
+Destination is updated to match source, including deleting files if necessary.
+Since this can cause data loss, test first with the --dry-run flag.
 
     rclone ls [remote:path]
 
diff --git a/docs/content/docs.md b/docs/content/docs.md
index 95da136bd..91f62c1e3 100644
--- a/docs/content/docs.md
+++ b/docs/content/docs.md
@@ -63,11 +63,10 @@ MD5SUM.  Doesn't delete files from the destination.
 
     rclone sync source:path dest:path
 
-Sync the source to the destination.  Doesn't transfer
-unchanged files, testing first by modification time then by
-size.  Deletes any files that exist in source that don't
-exist in destination. Since this can cause data loss, test
-first with the `--dry-run` flag.
+Sync the source to the destination, changing the destination only.  Doesn't
+transfer unchanged files, testing first by modification time then by size.
+Destination is updated to match source, including deleting files if necessary.
+Since this can cause data loss, test first with the --dry-run flag.
 
     rclone ls [remote:path]
 
diff --git a/rclone.go b/rclone.go
index 77c66b213..d178987d7 100644
--- a/rclone.go
+++ b/rclone.go
@@ -77,11 +77,11 @@ var Commands = []Command{
 		Name:     "sync",
 		ArgsHelp: "source:path dest:path",
 		Help: `
-        Sync the source to the destination.  Doesn't transfer
-        unchanged files, testing first by modification time then by
-        size.  Deletes any files that exist in source that don't
-        exist in destination. Since this can cause data loss, test
-        first with the --dry-run flag.`,
+        Sync the source to the destination, changing the destination only.
+        Doesn't transfer unchanged files, testing first by modification time
+        then by size.  Destination is updated to match source, including
+        deleting files if necessary.  Since this can cause data loss, test first
+        with the --dry-run flag.`,
 		Run: func(fdst, fsrc fs.Fs) {
 			err := fs.Sync(fdst, fsrc, true)
 			if err != nil {