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Readme.org

@@ -103,6 +103,34 @@ Like the *if form*, if the conditional returns a non-boolean value the *while lo
 
 **** TODO let
 **** TODO circuit
+**** not quite control flow
+Several other functions use lazy evaluation of their arguments. The below list is non-exhaustive:
+- toggle
+- inc
+- dec
+
+These functions are mentioned here for their use with control flow.
+- inc: increment a symbol by one
+- dec: decrement a symbol by one
+- toggle: flip a symbol from true to false, or vice versa
+
+For more information on these functions consult the output of the help function:
+#+BEGIN_SRC lisp
+λ (help toggle)
+NAME: toggle
+
+ARGS: 1 args of any type
+
+DOCUMENTATION:
+
+switches a boolean symbol between true or false.
+Takes a single argument (a symbol). Looks it up in the variable table.
+Either sets the symbol to true if it is currently false, or vice versa.
+
+CURRENT VALUE AND/OR BODY:
+<builtin>
+#+END_SRC
+
 *** TODO quote and eval
 *** TODO Defining variables and functions
 **** TODO Anatomy