diff --git a/src/spicelib/analysis/relananalysis.c b/src/spicelib/analysis/relananalysis.c
index 1c69cc864..1d673aa62 100644
--- a/src/spicelib/analysis/relananalysis.c
+++ b/src/spicelib/analysis/relananalysis.c
@@ -836,6 +836,13 @@ resume:
     Il tempo corrente CKTtime deve essere memorizzato insieme, in modo tale da poter poi calcolare il delta di tempo necessario al modello.
     QUI, deve essere controllato che all'istante precedente il device sia acceso (o spento). Se si manifesta un cambio, allora la fase di stress (o di recovery)
       è finita e bisogna calcolare il delta_vth attraverso il modello.
+*/
+/*  In RHSold, each device must access its own values ​​to see if it itself is on or off.
+    In the case of BSIM4, the rule Vgs > Vth applies, where Vgs = ckt->CKTrhsOld [here->BSIM4...] - ckt->CKTrhsOld [here->BSIM4...] and Vth = here->BSIM4vth .
+    If the transistor is on, a flag rises, private to the device, which indicates that it is on. If it is off, the same flag will be low.
+    The current CKTtime must be stored together, so that the delta time needed by the model can then be calculated.
+    HERE, it must be checked that the device was turned on (or off) at the previous moment. If a change occurs, then the stress (or recovery) phase
+    it's over and we need to calculate the delta_vth through the model.
 */
             CKTreliability (ckt, 0) ;