diff --git a/src/flash/nand/driver.h b/src/flash/nand/driver.h
index 4edce9fab..04ec64fcf 100644
--- a/src/flash/nand/driver.h
+++ b/src/flash/nand/driver.h
@@ -37,6 +37,9 @@ struct nand_flash_controller
 	/** Driver name that is used to select it from configuration files. */
 	const char *name;
 
+	/** Usage of flash command registration. */
+	const char *usage;
+
     const struct command_registration *commands;
 
 	/** NAND device command called when driver is instantiated during configuration. */
diff --git a/src/flash/nand/tcl.c b/src/flash/nand/tcl.c
index 5fba1bcc9..c6ea3f3b6 100644
--- a/src/flash/nand/tcl.c
+++ b/src/flash/nand/tcl.c
@@ -544,8 +544,7 @@ static COMMAND_HELPER(create_nand_device, const char *bank_name,
 
 	if (CMD_ARGC < 2)
 	{
-		LOG_ERROR("missing target");
-		return ERROR_COMMAND_ARGUMENT_INVALID;
+		return ERROR_COMMAND_SYNTAX_ERROR;
 	}
 	target = get_target(CMD_ARGV[1]);
 	if (!target) {
@@ -582,9 +581,12 @@ static COMMAND_HELPER(create_nand_device, const char *bank_name,
 	retval = CALL_COMMAND_HANDLER(controller->nand_device_command, c);
 	if (ERROR_OK != retval)
 	{
-		LOG_ERROR("'%s' driver rejected nand flash", controller->name);
+		assert(controller->usage != NULL);
+		LOG_ERROR("'%s' driver rejected nand flash. Usage: %s",
+			controller->name,
+			controller->usage);
 		free(c);
-		return ERROR_OK;
+		return retval;
 	}
 
 	nand_device_add(c);
@@ -596,8 +598,7 @@ COMMAND_HANDLER(handle_nand_device_command)
 {
 	if (CMD_ARGC < 2)
 	{
-		LOG_ERROR("incomplete nand device configuration");
-		return ERROR_FLASH_BANK_INVALID;
+		return ERROR_COMMAND_SYNTAX_ERROR;
 	}
 
 	// save name and increment (for compatibility) with drivers
diff --git a/src/flash/nor/driver.h b/src/flash/nor/driver.h
index afd05285a..3b8e31a00 100644
--- a/src/flash/nor/driver.h
+++ b/src/flash/nor/driver.h
@@ -56,6 +56,11 @@ struct flash_driver
 	 */
 	const char *name;
 
+	/**
+	 * Gives a human-readable description of arguments.
+	 */
+	const char *usage;
+
 	/**
 	 * An array of driver-specific commands to register.  When called
 	 * during the "flash bank" command, the driver can register addition