diff --git a/Bootloaders/CDC/BootloaderCDC.h b/Bootloaders/CDC/BootloaderCDC.h
index e4eebe7779..49fc6743df 100644
--- a/Bootloaders/CDC/BootloaderCDC.h
+++ b/Bootloaders/CDC/BootloaderCDC.h
@@ -54,7 +54,7 @@
 
 	/* Preprocessor Checks: */
 		#if !defined(__OPTIMIZE_SIZE__)
-			#error This bootloader requires that it be compiled for size, not speed, to fit into the target device.
+			#error This bootloader requires that it be optimize for size, not speed, to fit into the target device. Change optimization settings and try again.
 		#endif
 
 	/* Macros: */
diff --git a/Bootloaders/DFU/BootloaderDFU.h b/Bootloaders/DFU/BootloaderDFU.h
index 1ace570fea..f712c8f2a0 100644
--- a/Bootloaders/DFU/BootloaderDFU.h
+++ b/Bootloaders/DFU/BootloaderDFU.h
@@ -56,7 +56,7 @@
 
 	/* Preprocessor Checks: */
 		#if !defined(__OPTIMIZE_SIZE__)
-			#error This bootloader requires that it be compiled for size, not speed, to fit into the target device.
+			#error This bootloader requires that it be optimize for size, not speed, to fit into the target device. Change optimization settings and try again.
 		#endif
 
 	/* Macros: */
diff --git a/Bootloaders/HID/BootloaderHID.h b/Bootloaders/HID/BootloaderHID.h
index 1394b8222f..ff3115762e 100644
--- a/Bootloaders/HID/BootloaderHID.h
+++ b/Bootloaders/HID/BootloaderHID.h
@@ -50,7 +50,7 @@
 
 	/* Preprocessor Checks: */
 		#if !defined(__OPTIMIZE_SIZE__)
-			#error This bootloader requires that it be compiled for size, not speed, to fit into the target device.
+			#error This bootloader requires that it be optimize for size, not speed, to fit into the target device. Change optimization settings and try again.
 		#endif
 
 	/* Macros: */
diff --git a/Bootloaders/MassStorage/BootloaderMassStorage.h b/Bootloaders/MassStorage/BootloaderMassStorage.h
index 3a8e44b780..34297d4a5a 100644
--- a/Bootloaders/MassStorage/BootloaderMassStorage.h
+++ b/Bootloaders/MassStorage/BootloaderMassStorage.h
@@ -52,7 +52,7 @@
 
 	/* Preprocessor Checks: */
 		#if !defined(__OPTIMIZE_SIZE__)
-			#error This bootloader requires that it be compiled for size, not speed, to fit into the target device.
+			#error This bootloader requires that it be optimize for size, not speed, to fit into the target device. Change optimization settings and try again.
 		#endif
 
 	/* Macros: */
diff --git a/Bootloaders/Printer/BootloaderPrinter.h b/Bootloaders/Printer/BootloaderPrinter.h
index 19d36e050a..acd6001ff5 100644
--- a/Bootloaders/Printer/BootloaderPrinter.h
+++ b/Bootloaders/Printer/BootloaderPrinter.h
@@ -49,7 +49,7 @@
 
 	/* Preprocessor Checks: */
 		#if !defined(__OPTIMIZE_SIZE__)
-			#error This bootloader requires that it be compiled for size, not speed, to fit into the target device.
+			#error This bootloader requires that it be optimize for size, not speed, to fit into the target device. Change optimization settings and try again.
 		#endif
 
 	/* Macros: */