diff --git a/Makefile b/Makefile
index a48699c..6c8597b 100644
--- a/Makefile
+++ b/Makefile
@@ -343,6 +343,11 @@ $(GEN)/esp32_spi-flash.h: \
 	$< spi_flash_source $(VERSION) $(REVISION) \
     esp32/optional/spi-flash/spi-flash.fs >$@
 
+$(GEN)/esp32_espnow.h: \
+    tools/source_to_string.js esp32/optional/espnow/espnow.fs | $(GEN)
+	$< espnow_source $(VERSION) $(REVISION) \
+    esp32/optional/espnow/espnow.fs >$@
+
 $(GEN)/esp32_serial-bluetooth.h: \
     tools/source_to_string.js \
     esp32/optional/serial-bluetooth/bterm.fs \
@@ -358,7 +363,8 @@ OPTIONAL_MODULES = \
   $(ESP32)/ESP32forth/interrupts.h \
   $(ESP32)/ESP32forth/rmt.h \
   $(ESP32)/ESP32forth/serial-bluetooth.h \
-  $(ESP32)/ESP32forth/spi-flash.h
+  $(ESP32)/ESP32forth/spi-flash.h \
+  $(ESP32)/ESP32forth/espnow.h
 
 add-optional: $(OPTIONAL_MODULES)
 
@@ -702,6 +708,15 @@ $(ESP32)/ESP32forth/optional/spi-flash.h: \
      spi_flash=@$(GEN)/esp32_spi-flash.h \
      >$@
 
+$(ESP32)/ESP32forth/optional/espnow.h: \
+    esp32/optional/espnow/espnow.h \
+    $(GEN)/esp32_espnow.h | $(ESP32)/ESP32forth/optional
+	cat esp32/optional/espnow/espnow.h | tools/replace.js \
+     VERSION=$(VERSION) \
+     REVISION=$(REVISION) \
+     espnow=@$(GEN)/esp32_espnow.h \
+     >$@
+
 # ---- ESP32 ARDUINO BUILD AND FLASH ----
 
 ARDUINO_BUILDER="/mnt/c/Program Files (x86)/Arduino/arduino-builder.exe"
@@ -805,7 +820,8 @@ $(ESP32)/ESP32forth.zip: \
     $(ESP32)/ESP32forth/optional/interrupts.h \
     $(ESP32)/ESP32forth/optional/rmt.h \
     $(ESP32)/ESP32forth/optional/serial-bluetooth.h \
-    $(ESP32)/ESP32forth/optional/spi-flash.h
+    $(ESP32)/ESP32forth/optional/spi-flash.h \
+    $(ESP32)/ESP32forth/optional/espnow.h
 	cd $(ESP32) && rm -f ESP32forth.zip && zip -r ESP32forth.zip ESP32forth
 
 # ---- Publish to Archive ----
diff --git a/esp32/builtins.h b/esp32/builtins.h
index 74b37a6..663f2e7 100644
--- a/esp32/builtins.h
+++ b/esp32/builtins.h
@@ -84,6 +84,14 @@
 #  define OPTIONAL_SPI_FLASH_SUPPORT
 # endif
 
+// Hook to pull in optional ESPNOW support.
+# if __has_include("espnow.h")
+#  include "espnow.h"
+# else
+#  define OPTIONAL_ESPNOW_VOCABULARY
+#  define OPTIONAL_ESPNOW_SUPPORT
+# endif
+
 static cell_t ResizeFile(cell_t fd, cell_t size);
 
 #endif
@@ -119,7 +127,8 @@ static cell_t ResizeFile(cell_t fd, cell_t size);
   OPTIONAL_OLED_SUPPORT \
   OPTIONAL_RMT_SUPPORT \
   OPTIONAL_SERIAL_BLUETOOTH_SUPPORT \
-  OPTIONAL_SPI_FLASH_SUPPORT
+  OPTIONAL_SPI_FLASH_SUPPORT \
+  OPTIONAL_ESPNOW_SUPPORT
 
 #define REQUIRED_MEMORY_SUPPORT \
   YV(internals, MALLOC, SET malloc(n0)) \
diff --git a/esp32/optional/README-optional.txt b/esp32/optional/README-optional.txt
index b8fee01..00c2962 100644
--- a/esp32/optional/README-optional.txt
+++ b/esp32/optional/README-optional.txt
@@ -16,6 +16,7 @@ These are the current optional modules:
   * serial-bluetooth.h - Support for Bluetooth serial and
                          bterm a Bluetooth serial redirector for the terminal
   * spi-flash.h - Support for low level SPI Flash partition access
+  * espnow.h - Support for ESP NOW
 
 Initially ESP32forth focused on a minimal C kernel, with most functionality
 built in Forth code loaded at boot. Eventually, as support for more capabilities
diff --git a/esp32/optional/espnow/espnow.fs b/esp32/optional/espnow/espnow.fs
new file mode 100644
index 0000000..8449699
--- /dev/null
+++ b/esp32/optional/espnow/espnow.fs
@@ -0,0 +1,40 @@
+\ Copyright 2023 Daniel Nagy
+\
+\ Licensed under the Apache License, Version 2.0 (the "License");
+\ you may not use this file except in compliance with the License.
+\ You may obtain a copy of the License at
+\
+\     http://www.apache.org/licenses/LICENSE-2.0
+\
+\ Unless required by applicable law or agreed to in writing, software
+\ distributed under the License is distributed on an "AS IS" BASIS,
+\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+\ See the License for the specific language governing permissions and
+\ limitations under the License.
+
+vocabulary espnow   espnow definitions
+transfer espnow-builtins
+DEFINED? ESPNOW_init [IF]
+\ error codes from https://github.com/espressif/esp-idf/blob/master/components/esp_common/include/esp_err.h
+0 constant ESP_OK
+-1 constant ESP_FAIL
+$101 constant ESP_ERR_NO_MEM              \ Out of memory
+$102 constant ESP_ERR_INVALID_ARG         \ Invalid argument
+$103 constant ESP_ERR_INVALID_STATE       \ Invalid state
+$104 constant ESP_ERR_INVALID_SIZE        \ Invalid size
+$105 constant ESP_ERR_NOT_FOUND           \ Requested resource not found
+$106 constant ESP_ERR_NOT_SUPPORTED       \ Operation or feature not supported
+$107 constant ESP_ERR_TIMEOUT             \ Operation timed out
+$108 constant ESP_ERR_INVALID_RESPONSE    \ Received response was invalid
+$109 constant ESP_ERR_INVALID_CRC         \ CRC or checksum was invalid
+$10A constant ESP_ERR_INVALID_VERSION     \ Version was invalid
+$10B constant ESP_ERR_INVALID_MAC         \ MAC address was invalid
+$10C constant ESP_ERR_NOT_FINISHED        \ Operation has not fully completed
+
+$3000 constant ESP_ERR_WIFI_BASE          \ Starting number of WiFi error codes
+$3000 constant ESP_ERR_MESH_BASE          \ Starting number of MESH error codes
+$6000 constant ESP_ERR_FLASH_BASE         \ Starting number of flash error codes
+$c000 constant ESP_ERR_HW_CRYPTO_BASE     \ Starting number of HW cryptography module error codes
+$d000 constant ESP_ERR_MEMPROT_BASE       \ Starting number of Memory Protection API error codes
+[THEN]
+forth definitions
diff --git a/esp32/optional/espnow/espnow.h b/esp32/optional/espnow/espnow.h
new file mode 100644
index 0000000..da6535e
--- /dev/null
+++ b/esp32/optional/espnow/espnow.h
@@ -0,0 +1,43 @@
+// Copyright 2023 Daniel Nagy
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+ * ESP32forth ESPNOW v{{VERSION}}
+ * Revision: {{REVISION}}
+ */
+
+// More documentation
+// https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_now.html
+
+#include <esp_now.h>
+
+static esp_err_t ESPNOW_add_peer (const uint8_t *broadcastAddress) {
+  esp_now_peer_info_t peerInfo = {0};
+  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
+  peerInfo.channel = 0; // use current wifi channel
+  peerInfo.encrypt = false;
+  return esp_now_add_peer(&peerInfo);
+}
+
+#define OPTIONAL_ESPNOW_VOCABULARY V(espnow)
+#define OPTIONAL_ESPNOW_SUPPORT \
+  XV(internals, "espnow-source", ESPNOW_SOURCE, \
+      PUSH espnow_source; PUSH sizeof(espnow_source) - 1) \
+  YV(espnow, espnow_init    , PUSH esp_now_init()) \
+  YV(espnow, espnow_deinit  , PUSH esp_now_deinit()) \
+  YV(espnow, espnow_add_peer, n0 = ESPNOW_add_peer(b0)) \
+  YV(espnow, espnow_send    , n0 = esp_now_send(b2, b1, n0); NIPn(2)) \
+
+
+{{espnow}}
diff --git a/esp32/optionals.fs b/esp32/optionals.fs
index 9f5d7df..583985b 100644
--- a/esp32/optionals.fs
+++ b/esp32/optionals.fs
@@ -47,3 +47,7 @@ internals DEFINED? serial-bluetooth-source [IF]
 internals DEFINED? spi-flash-source [IF]
   spi-flash-source evaluate
 [THEN] forth
+
+internals DEFINED? espnow-source [IF]
+  espnow-source evaluate
+[THEN] forth
diff --git a/esp32/options.h b/esp32/options.h
index 6250c6e..97074a8 100644
--- a/esp32/options.h
+++ b/esp32/options.h
@@ -95,4 +95,5 @@
   OPTIONAL_OLED_VOCABULARY \
   OPTIONAL_RMT_VOCABULARY \
   OPTIONAL_SPI_FLASH_VOCABULARY \
+  OPTIONAL_ESPNOW_VOCABULARY \
   USER_VOCABULARIES
diff --git a/esp32/print-builtins.cpp b/esp32/print-builtins.cpp
index c5e1037..b8cb522 100644
--- a/esp32/print-builtins.cpp
+++ b/esp32/print-builtins.cpp
@@ -31,6 +31,7 @@
 #define OPTIONAL_RMT_SUPPORT
 #define OPTIONAL_SERIAL_BLUETOOTH_SUPPORT
 #define OPTIONAL_SPI_FLASH_SUPPORT
+#define OPTIONAL_ESPNOW_SUPPORT
 
 #define OPTIONAL_BLUETOOTH_VOCABULARY
 #define OPTIONAL_CAMERA_VOCABULARY
@@ -38,6 +39,7 @@
 #define OPTIONAL_OLED_VOCABULARY
 #define OPTIONAL_RMT_VOCABULARY
 #define OPTIONAL_SPI_FLASH_VOCABULARY
+#define OPTIONAL_ESPNOW_VOCABULARY
 
 #include "builtins.h"
 
diff --git a/esp32/sim_main.cpp b/esp32/sim_main.cpp
index 7ca335e..4eafee3 100644
--- a/esp32/sim_main.cpp
+++ b/esp32/sim_main.cpp
@@ -28,6 +28,7 @@
 #define OPTIONAL_OLED_VOCABULARY
 #define OPTIONAL_RMT_VOCABULARY
 #define OPTIONAL_SPI_FLASH_VOCABULARY
+#define OPTIONAL_ESPNOW_VOCABULARY
 
 static cell_t *simulated(cell_t *sp, const char *op);
 
diff --git a/examples/espnow.fs b/examples/espnow.fs
new file mode 100644
index 0000000..166173b
--- /dev/null
+++ b/examples/espnow.fs
@@ -0,0 +1,37 @@
+#! /usr/bin/env ueforth
+
+\ Copyright 2023 Daniel Nagy
+\
+\ Licensed under the Apache License, Version 2.0 (the "License");
+\ you may not use this file except in compliance with the License.
+\ You may obtain a copy of the License at
+\
+\     http://www.apache.org/licenses/LICENSE-2.0
+\
+\ Unless required by applicable law or agreed to in writing, software
+\ distributed under the License is distributed on an "AS IS" BASIS,
+\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+\ See the License for the specific language governing permissions and
+\ limitations under the License.
+
+also WiFi
+also espnow
+
+\ start wifi
+WIFI_MODE_STA WiFi.mode
+\ initialize espnow and check result
+espnow_init ESP_OK <> throw
+
+: espnow_register_example
+  \ register the mac 12:34:56:78:9a:bc as a peer
+  $12 c, $34 c, $56 c, $78 c, $9a c, $bc c,
+  here 6 -
+  ESPNOW_add_peer ESP_OK <> throw
+  -6 allot
+;
+: espnow_send_some
+  \ NULL a.k.a. send to peerlist
+  \ send 10 bytes of data space pointer
+  0 here 10 - 10
+  espnow_send ESP_OK <> throw
+;
diff --git a/site/ESP32forth.html b/site/ESP32forth.html
index b973183..b79415c 100644
--- a/site/ESP32forth.html
+++ b/site/ESP32forth.html
@@ -1055,6 +1055,36 @@ <h5 id="timers">Timers</h5>
 TIMGn_Tx_INT_CLR_REG ( n -- a )
 </pre>
 
+<h5 id="espnow">ESPNOW</h5>
+These words are inside the <code>espnow</code> vocabulary.
+<p><b>
+  NOTE: The optional module espnow.h must be
+  placed next to ESP32forth.ino to include this capability.
+</b></p>
+<pre>
+
+espnow_init ( -- err )
+espnow_deinit ( -- err )
+espnow_add_peer ( a -- err )
+espnow_send ( b2 b1 n0 -- err )
+
+( Constants )
+ESP_OK
+ESP_FAIL
+ESP_ERR_NO_MEM              \ Out of memory
+ESP_ERR_INVALID_ARG         \ Invalid argument
+ESP_ERR_INVALID_STATE       \ Invalid state
+ESP_ERR_INVALID_SIZE        \ Invalid size
+ESP_ERR_NOT_FOUND           \ Requested resource not found
+ESP_ERR_NOT_SUPPORTED       \ Operation or feature not supported
+ESP_ERR_TIMEOUT             \ Operation timed out
+ESP_ERR_INVALID_RESPONSE    \ Received response was invalid
+ESP_ERR_INVALID_CRC         \ CRC or checksum was invalid
+ESP_ERR_INVALID_VERSION     \ Version was invalid
+ESP_ERR_INVALID_MAC         \ MAC address was invalid
+ESP_ERR_NOT_FINISHED        \ Operation has not fully completed
+</pre>
+
 <h3 id="adding_words">Adding Words</h3>
 
 <p>