diff --git a/flash.h b/flash.h
index 9129335..c6173ba 100644
--- a/flash.h
+++ b/flash.h
@@ -198,6 +198,8 @@
 	} writability;
 };
 
+struct wp_bits;
+
 struct flashchip {
 	const char *vendor;
 	const char *name;
@@ -306,6 +308,10 @@
 		/* Complement bit (CMP) */
 		struct reg_bit_info cmp;
 	} reg_bits;
+
+	/* Function that takes a set of WP config bits (e.g. BP, SEC, TB, etc) */
+	/* and determines what protection range they select. */
+	void (*decode_range)(size_t *start, size_t *len, const struct wp_bits *, size_t chip_len);
 };
 
 typedef int (*chip_restore_fn_cb_t)(struct flashctx *flash, uint8_t status);