diff --git a/docs/ONU_Upgrade_Notes.md b/docs/ONU_Upgrade_Notes.md
index a7668ae..b0ef131 100644
--- a/docs/ONU_Upgrade_Notes.md
+++ b/docs/ONU_Upgrade_Notes.md
@@ -195,5 +195,5 @@
 
 The 'activity' commands [download](#image-download-from-http-server-to-the-onu), [activate](#image-activation-on-the-onu), [commit](#image-commit-on-the-onu) and [abort](#image-activity-abort) provide an immediate response for the ONU related image states. These states then indicate that either the requested activity has just started or some processing problem was immediately detected that denies the execution of the request. In case no immediate error was found the requested processing is internally (in the ONU adapter) continued. This makes it necessary to verify the progress of the activity using the [status](#image-status-display) command. On success or later failure detection according image state indications are given that can be verified in order to detect the end and the result of the activity.
 
-The PDF document [OnuUpgradeStatesOvw](docs/OnuUpgradeStatesOvw.pdf) gives on overview of the main image state transitions implemented in the ONU adapter and can be used as guideline for such user interface verification.
+The PDF document [OnuUpgradeStatesOvw](OnuUpgradeStatesOvw.pdf) gives on overview of the main image state transitions implemented in the ONU adapter and can be used as guideline for such user interface verification.
 In the end the [list](#images-list-on-the-onu) command should be used in any case to verify the real situation on the concerned ONU.