FAQ.md

@@ -31,6 +31,8 @@
     * Search the backbone code for the parameter name and you will see from where it is read. You can for example search the backbone/inc folder using VS Code´s "find in folder" or search the Backbone.lst file from your last run using GAMS Studio.
 * **That p_gnu_io sheet doesn´t really make sense to me.**
     * A unit can create (output), consume (input) or convert (in- and output) energy. The sheet specifies for each unit, from which node (in which grid) an input comes and to which node (in which grid) an output goes.
+* **The value op01 is not respected as the maximum operation point of a unit.**
+    * op01*capacity is not the maximum capacity of the unit - that´s simply "capacity". Just ignore the misleading VTT Wiki "On *p_unit* set *availability* to "1" and define *op00* and *op01* as the limits for operating shares, e.g. if the unit can operate at 40-100 % of maximum capasity, set *op00*=0,40 and *op01*=1,00."
 
 # Pypsa-eur
 * **When using pypsa-eur, I get the error "symbolic privilege not held".**