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+.. _arduino-comments:
+
+Comments
+========
+
+Comments are lines in the program that are used to inform yourself
+or others about the way the program works. They are ignored by the
+compiler, and not exported to the processor, so they don't take up
+any space on the Atmega chip.
+
+
+
+Comments only purpose are to help you understand (or remember) how
+your program works or to inform others how your program works.
+There are two different ways of marking a line as a comment:
+
+
+
+Example
+-------
+
+::
+
+     x = 5;  // This is a single line comment. Anything after the slashes is a comment 
+             // to the end of the line
+    
+    /* this is multiline comment - use it to comment out whole blocks of code
+    
+    if (gwb == 0){   // single line comment is OK inside a multiline comment
+    x = 3;           /* but not another multiline comment - this is invalid */
+    }
+    // don't forget the "closing" comment - they have to be balanced!
+    */
+
+
+
+**Tip**
+When experimenting with code, "commenting out" parts of your
+program is a convenient way to remove lines that may be buggy. This
+leaves the lines in the code, but turns them into comments, so the
+compiler just ignores them. This can be especially useful when
+trying to locate a problem, or when a program refuses to compile
+and the compiler error is cryptic or unhelpful.
+
+