1 files changed, 2 insertions, 1 deletions
diff --git a/NK_C_API.h b/NK_C_API.h
index 2d05a15..520d5e0 100644
--- a/NK_C_API.h
+++ b/NK_C_API.h
@@ -775,7 +775,8 @@ extern "C" {
 	/**
 	 * Get progress value of current long operation.
 	 * Storage only
-	 * @return int in range 0-100 or -1 if device is not busy
+	 * @return int in range 0-100 or -1 if device is not busy or -2 if an
+	 *         error occured
 	 */
 	NK_C_API int NK_get_progress_bar_value();