diff --git a/site/ESP32forth.html b/site/ESP32forth.html
index 4abb715..b7db727 100644
--- a/site/ESP32forth.html
+++ b/site/ESP32forth.html
@@ -360,6 +360,10 @@ Serial.flush ( -- )   Flush serial buffer
 
 <h5>Serial Bluetooth</h5>
 These words are inside the <code>bluetooth</code> vocabulary.
+<p><b>
+  NOTE: Starting in v7.0.7.13 the optional module serial-bluetooth.h must be
+  placed next to ESP32forth.ino to include this capability.
+</b></p>
 <pre>
 SerialBT.new ( -- bt )   Allocate new BT object
 SerialBT.delete ( bt -- )   Free BT object
@@ -472,6 +476,10 @@ MDNS.begin ( name-z -- )   Start multicast dns
 
 <h5>SPI Flash</h5>
 These words are inside the <code>spi_flash</code> vocabulary.
+<p><b>
+  NOTE: Starting in v7.0.7.13 the optional module spi-flash.h must be
+  placed next to ESP32forth.ino to include this capability.
+</b></p>
 <pre>
 spi_flash_init ( -- ) Init driver access.
 spi_flash_get_chip_size ( -- n ) Get flash size.
@@ -608,6 +616,10 @@ Wire.readTransmission ( addr a n sendstop acount -- err )
 
 <h5>Camera</h5>
 These words are inside the <code>camera</code> vocabulary.
+<p><b>
+  NOTE: Starting in v7.0.7.13 the optional module camera.h must be
+  placed next to ESP32forth.ino to include this capability.
+</b></p>
 <pre>
 esp_camera_init ( config -- f )
 esp_camera_deinit ( -- f )