Am 09.09.2014 um 18:44 schrieb seasoul :

Is there an already-exsting or easy way to add annotations to equations, just something like

annotation1.png

You can use the \underbrace and \overbrace commands. \starttext \startformula \underbrace{f(n)}_{\text{Output}} = \underbrace{\overbrace{n}^{\text{Input}} + 3}_{\text{Rule for Function}} \stopformula \stoptext Wolfgang