-#define SRD_ERR_ARG -3 /**< Function argument error */
-#define SRD_ERR_PYTHON -4 /**< Python C API error */
-#define SRD_ERR_DECODERS_DIR -5 /**< Protocol decoder path invalid */
+#define SRD_ERR_ARG -3 /**< Function argument error */
+#define SRD_ERR_BUG -4 /**< Errors hinting at internal bugs */
+#define SRD_ERR_PYTHON -5 /**< Python C API error */
+#define SRD_ERR_DECODERS_DIR -6 /**< Protocol decoder path invalid */