diff --git a/gcp b/gcp
index f6cd11a..7cfaf04 100755
--- a/gcp
+++ b/gcp
@@ -43,7 +43,7 @@ try:
 except ImportError,e:
     error(_("Error during import"))
     error(_("Please check dependecies:"),e)
-    exit(2)
+    exit(1)
 try:
     from progressbar import ProgressBar, Percentage, Bar, ETA, FileTransferSpeed
     pbar_available=True
@@ -622,7 +622,7 @@ class GCP():
             error (_("Invalide --preserve value\nvalid values are:"))
             for value in const_PRESERVE:
                 error('- %s' % value)
-            exit(2)
+            exit(1)
         else:
             options.preserve = preserve
 
diff --git a/gcp.1 b/gcp.1
index a2c6dac..58bb727 100644
--- a/gcp.1
+++ b/gcp.1
@@ -102,6 +102,14 @@ List the names of source file lists.
 .TP
 .B \-\-sources\-full\-list
 List the names of source file lists, including their content.
+.SH EXIT STATUS
+The exit status can be:
+.IP \[bu] 2
+\fB0\fP if files have been copied correctly or if an other instance of gcp is already running and will do the copy.
+.IP \[bu]
+\fB1\fP if at least one file has not been copied, or if something went wrong.
+.IP \[bu]
+\fB2\fP if all files have been copied but with some issues
 .SH LIMITS
 Timestamps preservation with \-\-preserve option is limited by the os python
 module on POSIX systems. Currently, python only returns timestamps in float