diff --git a/models/lms.model b/models/lms.model
index 616940762..9f3fc2288 100644
--- a/models/lms.model
+++ b/models/lms.model
@@ -40,18 +40,19 @@ Qualification
 --  - PinReset==1 mit bestehendem Passwort kann problemlos erneut gesendet werden
 --  - Flag "interner Mitarbeiter" wird von Know-How ignoriert / nicht ausgewertet (legacy)
 
-QualificationPrecondition                       -- NOTE: this can only be enforced through a background job adding or removing qualifications
-  qualification     QualificationId OnDeleteCascade OnUpdateCascade -- AND: not unique, ie. qualification can have multiple required preconditions
-  required          [QualificationId]           -- OR : alternatives, any one will suffice
-  continuous        Bool                        -- expiring precondition blocks qualification
-  deriving Generic
+-- QualificationPrecondition                       -- NOTE: this can only be enforced through a background job adding or removing qualifications
+--   qualification     QualificationId OnDeleteCascade OnUpdateCascade -- AND: not unique, ie. qualification can have multiple required preconditions
+--   required          [QualificationId]           -- OR : alternatives, any one will suffice
+--   continuous        Bool                        -- expiring precondition blocks qualification
+--   deriving Generic
 
 -- Maybe an alternative for online qualification validity checking, transitivity through recursive CTEs? (already available in our version)
--- QualificationRequirement
---   qualification     QualificationId OnDeleteCascade OnUpdateCascade
---   requirement       QualificationId OnDeleteCascade OnUpdateCascade
---   group             Text -- OR: several requirements within the same group are considered equivalent
---   UniqueQualificationRequirement qualification requirement
+QualificationRequirement
+   qualification     QualificationId OnDeleteCascade OnUpdateCascade
+   requirement       QualificationId OnDeleteCascade OnUpdateCascade
+   group             Text -- OR: several requirements within the same group are considered equivalent
+   UniqueQualificationRequirement qualification requirement
+   deriving Generic
 --
 
 -- TODO: connect Qualification with Exams!
@@ -81,6 +82,7 @@ QualificationUserBlock
   from              UTCTime  
   reason            Text  
   blocker           UserId Maybe
+  precondition      Bool  default=false  -- if true, this was due to a precondition
   deriving Eq Ord Read Show Generic
 
   -- LMS Interface Tables, need regular processing by background jobs, per QualificationId: