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+.. _arduino-include:
+
+#include
+========
+
+**#include** is used to include outside libraries in your sketch.
+This gives the programmer access to a large group of standard C
+libraries (groups of pre-made functions), and also libraries
+written especially for Arduino.
+
+
+
+The main reference page for AVR C libraries (AVR is a reference to
+the Atmel chips on which the Arduino is based) is
+`here. <http://www.nongnu.org/avr-libc/user-manual/modules.html>`_
+
+
+
+Note that **#include**, similar to **#define**, has no semicolon
+terminator, and the compiler will yield cryptic error messages if
+you add one.
+
+
+
+Example
+-------
+
+This example includes a library that is used to put data into the
+program space *flash* instead of *ram*. This saves the ram space
+for dynamic memory needs and makes large lookup tables more
+practical.
+
+
+
+::
+
+    #include <avr/pgmspace.h>
+    
+    prog_uint16_t myConstants[] PROGMEM = {0, 21140, 702  , 9128,  0, 25764, 8456,
+    0,0,0,0,0,0,0,0,29810,8968,29762,29762,4500};
+
+