diff --git a/flashchips.c b/flashchips.c
index cfdaa13..39fbc2d 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -19703,7 +19703,8 @@
 		.model_id	= WINBOND_NEX_W25X05,
 		.total_size	= 64,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		/* FEATURE_FAST_READ_DIO since W25X05B */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19735,7 +19736,8 @@
 		.model_id	= WINBOND_NEX_W25X10,
 		.total_size	= 128,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		/* FEATURE_FAST_READ_DIO since W25X10B */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19767,7 +19769,7 @@
 		.model_id	= WINBOND_NEX_W25X16,
 		.total_size	= 2048,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19805,7 +19807,8 @@
 		.model_id	= WINBOND_NEX_W25X20,
 		.total_size	= 256,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		/* FEATURE_FAST_READ_DIO since W25X20B */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19837,7 +19840,7 @@
 		.model_id	= WINBOND_NEX_W25X32,
 		.total_size	= 4096,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19875,7 +19878,8 @@
 		.model_id	= WINBOND_NEX_W25X40,
 		.total_size	= 512,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		/* FEATURE_FAST_READ_DIO since W25X40B */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19907,7 +19911,7 @@
 		.model_id	= WINBOND_NEX_W25X64,
 		.total_size	= 8192,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
@@ -19945,7 +19949,8 @@
 		.model_id	= WINBOND_NEX_W25X80,
 		.total_size	= 1024,
 		.page_size	= 256,
-		.feature_bits	= FEATURE_WRSR_WREN,
+		/* FEATURE_FAST_READ_DIO since W25X80B */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_FAST_READ_DOUT,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,