diff --git a/pico-ice/CMakeLists.txt b/pico-ice/CMakeLists.txt
index e072ce4..7177d1b 100644
--- a/pico-ice/CMakeLists.txt
+++ b/pico-ice/CMakeLists.txt
@@ -29,6 +29,7 @@ add_executable(${CMAKE_PROJECT_NAME} main.c)
 target_link_libraries(${CMAKE_PROJECT_NAME}
     pico_ice_sdk
     pico_stdio_usb
+    hardware_adc
 )
 target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
    ${CMAKE_CURRENT_SOURCE_DIR}/../
diff --git a/pico-ice/builtins.h b/pico-ice/builtins.h
index 03d38ba..a0145f4 100644
--- a/pico-ice/builtins.h
+++ b/pico-ice/builtins.h
@@ -27,6 +27,7 @@
 # include "ice_led.h"
 # include "ice_spi.h"
 # include "ice_sram.h"
+# include "hardware/adc.h"
 #endif
 
 // TODO: Implement RESIZE-FILE.
@@ -42,6 +43,7 @@
   OPTIONAL_LED_SUPPORT \
   OPTIONAL_SPI_SUPPORT \
   OPTIONAL_SRAM_SUPPORT \
+  OPTIONAL_ADC_SUPPORT \
   CALLING_OPCODE_LIST \
   FLOATING_POINT_LIST
 
@@ -160,7 +162,29 @@
    YV(ice, ice_sram_write_blocking, ice_sram_write_blocking(n2, b1, n0); DROPn(3))
 #endif
 
-#define VOCABULARY_LIST V(forth) V(internals) V(ice)
+#ifdef UEFORTH_SIM
+# define OPTIONAL_ADC_SUPPORT
+#else
+# define OPTIONAL_ADC_SUPPORT \
+   YV(pico, adc_init, adc_init()) \
+   YV(pico, adc_gpio_init, adc_gpio_init(n0); DROP) \
+   YV(pico, adc_select_input, adc_select_input(n0); DROP) \
+   YV(pico, adc_get_selected_input, PUSH adc_get_selected_input()) \
+   YV(pico, adc_set_round_robin, adc_set_round_robin(n0); DROP) \
+   YV(pico, adc_set_temp_sensor_enabled, adc_set_temp_sensor_enabled(n0); DROP) \
+   YV(pico, adc_read, PUSH adc_read()) \
+   YV(pico, adc_run, adc_run(n0); DROP) \
+   YV(pico, adc_set_clkdiv, adc_set_clkdiv(*fp--)) \
+   YV(pico, adc_fifo_setup, adc_fifo_setup(n4, n3, n2, n1, n0); DROPn(5)) \
+   YV(pico, adc_fifo_is_empty, PUSH adc_fifo_is_empty()) \
+   YV(pico, adc_fifo_get_level, PUSH adc_fifo_get_level()) \
+   YV(pico, adc_fifo_get, PUSH adc_fifo_get()) \
+   YV(pico, adc_fifo_get_blocking, PUSH adc_fifo_get_blocking()) \
+   YV(pico, adc_fifo_drain, adc_fifo_drain()) \
+   YV(pico, adc_irq_set_enabled, adc_irq_set_enabled(n0))
+#endif
+
+#define VOCABULARY_LIST V(forth) V(internals) V(pico) V(ice)
 
 #define PATH_MAX 256
 static char filename[PATH_MAX];
diff --git a/site/pico-ice.html b/site/pico-ice.html
index 0cb4787..8f53d10 100644
--- a/site/pico-ice.html
+++ b/site/pico-ice.html
@@ -139,6 +139,29 @@ REPOSITION-FILE ( n fh -- ior )
 FILE-SIZE ( fh -- n ior )
 </pre>
 
+<h5>pico</h5>
+These words are inside the <code>pico</code> vocabulary.
+See <a href="https://www.raspberrypi.com/documentation/pico-sdk/hardware.html">here</a>
+for details on the underlying hardware SDK.
+<pre>
+adc_init ( -- ) Initialize HW ADC
+adc_gpio_init ( n -- ) Init GPIO for use as ADC
+adc_select_input ( n -- ) Select ADC input
+adc_get_selected_input ( -- n ) Get selected ADC input
+adc_set_round_robin ( mask -- ) Round robin sampler selector
+adc_set_temp_sensor_enabled ( f -- ) Enable/disable onboard tempurature sensor
+adc_read ( -- u ) Perform a single conversion
+adc_run ( f -- ) Enable/disable free-running sample mode
+adc_set_clkdiv ( f: clkdiv -- ) Set ADC clock divisor
+adc_fifo_setup ( en dreq_en dreq_thresh err_in_fifo byte_shift -- ) Setup ADC FIFO
+adc_fifo_is_empty ( -- f ) Check FIFO empty state
+adc_fifo_get_level ( -- n ) Get number ADC FIFO entries
+adc_fifo_get ( -- n ) Get ADC result from FIFO
+adc_fifo_drain ( -- ) Drain FIFO.
+adc_fifo_get_blocking ( -- n ) Wait for ADC to have data
+adc_irq_set_enabled ( f -- ) Enable/disable ADC interrupts
+</pre>
+
 <h5>ice</h5>
 These words are inside the <code>ice</code> vocabulary.
 See <a href="https://pico-ice.tinyvision.ai/pico_ice_sdk.html">here</a>