diff --git a/lib/cyclic-hash/decr b/lib/cyclic-hash/decr
index 41f572b..6f0c053 100755
--- a/lib/cyclic-hash/decr
+++ b/lib/cyclic-hash/decr
@@ -1,3 +1,3 @@
 #!/bin/sh
 
-/usr/bin/env php $(realpath $(dirname $0))/source/decr.php;
+/usr/bin/env php $(realpath $(dirname $0))/source/decr.php $1;
diff --git a/lib/cyclic-hash/source/decr.php b/lib/cyclic-hash/source/decr.php
index 37ba7dc..fd8d1de 100755
--- a/lib/cyclic-hash/source/decr.php
+++ b/lib/cyclic-hash/source/decr.php
@@ -1,5 +1,5 @@
 <?php
-	
+
 	require_once __DIR__.'/../../include/php/const';
 
 
@@ -24,14 +24,14 @@
 
 
 
-	function cyclichash_decr(){
+	function cyclichash_decr($decr_factor=-1){
 
 		/* [2] Fetch necessary data
 		=========================================================*/
 
 		/* (1) Fetch secret file */
 		$secret = @file_get_contents(SECRET_CONF);
-		
+
 		/* (2) Check secret file format */
 		if( !is_string($secret) || !preg_match("/^(.{".SECRET_SIZE."}):(\d+):(.{".SECRET_SIZE."})$/", $secret, $match) ){
 
@@ -59,7 +59,7 @@
 		if( $depth > 1 ){
 
 			/* (1) Decrement the depth */
-			$depth--;
+			$depth += $decr_factor;
 
 			/* (2) Try to override the secret file */
 			if( @file_put_contents(SECRET_CONF, "$key:$depth:$next") ){
@@ -74,7 +74,7 @@
 		/* [4] If cannot decrement, use new secret and generate next
 		=========================================================*/
 		}else{
-			
+
 			// Generate new secret
 			$secret = $next.':999:'.generate_secret();
 
@@ -94,7 +94,10 @@
 
 	}
 
-	echo cyclichash_decr();
+	// IF received 'revert' as $1 -> increment ELSE decrement (default)
+	$decr_factor = ( $argc < 2 || $argv[1] != 'revert' ) ? -1 : +1;
+
+	echo cyclichash_decr($decr_factor);
 
 
 ?>