Help with reformable religion modding

[Aethes]

Im trying to make a custom religion reformable but I couldnt manage to do so so far. What line exactly makes a religion reformable? And which file is it in?

 

[Vinroke]

Define the reformed religion before the un-reformed version in common/religions/00_religions.txt

custom_religion_reformed = {
#

       high_god_name = GOD_THE_GODS
      
       crusade_name = "HOLY_WAR"
       scripture_name = THE_LEGENDS
       priest_title = PRIEST
      
       god_names = {
           GOD_THE_PANTHEON
       }
       evil_god_names = {
           GOD_THE_DARK_HAND
       }
      
       priests_can_marry = no
       priests_can_inherit = no

       religious_clothing_head = 12
       religious_clothing_priest = 12
          
       allow_in_ruler_designer = no
}

custom_religion = {

       high_god_name = GOD_THE_GODS
      
       crusade_name = "HOLY_WAR"
       scripture_name = THE_LEGENDS
       priest_title = PRIEST
      
       god_names = {
           GOD_THE_PANTHEON
       }
       evil_god_names = {
           GOD_THE_DARK_HAND
       }
      

       reformed = old_gods_reformed

       priests_can_marry = no
       priests_can_inherit = no

       religious_clothing_head = 12
       religious_clothing_priest = 12
          
       allow_in_ruler_designer = no
}

 

[Aethes]

Thank you so much, It worked. Turns out that I kept on forgetting to add
reformed = old_gods_reformed to the old religion