diff --git a/Database.md b/Database.md
index 9f64850..2cba7d0 100644
--- a/Database.md
+++ b/Database.md
@@ -50,51 +50,62 @@ Assignment table represents exercise assignment in a group. It holds keys of the
 
 ## ReferenceSolutionEvaluation
 
+- _referenceSolution_ -- solution to which this evaluation belongs to
+- _hwGroup_ -- hardware group which was used during execution on worker
+- _resultsUrl_ -- filserver address from which results of reference evaluation can be internally accessed
+- _evaluation_ -- associated general evaluation
+
 ## ReportedErrors
 
+- _type_ -- textual description of error type
+- _recipients_ -- list of email addresses to which error was sent
+- _subject_ -- subject as it was sent in email
+- _sentAt_ -- datetime when email with error report was sent
+- _description_ -- message as it was sent in email
+
 ## Resource
 
-- _id_ --
-- _permissions_ --
+- _id_ -- textual identification of resource
+- _permissions_ -- permissions associated with this resource
 
 ## Role
 
-- _id_ --
-- _parentRole_ --
-- _childRoles_ --
-- _permissions_ --
+- _id_ -- role textual identification
+- _parentRole_ -- reference to parent role
+- _childRoles_ -- array of roles which have this one as parent
+- _permissions_ -- permissions which are connected to this role
 
 ## RuntimeEnvironment
 
-- _name_ --
-- _language_ --
-- _extensions_ --
-- _platform_ --
-- _description_ --
+- _name_ -- human readable name of runtime environment
+- _language_ -- language which can be used in this environment
+- _extensions_ -- list of extensions in yaml format
+- _platform_ -- textual description of platform
+- _description_ -- some further description concerning this environment
 
 ## Solution
 
-- _user_ --
-- _files_ --
-- _solutionRuntimeConfig_ --
-- _evaluated_ --
+- _user_ -- user to whom this solution belongs to
+- _files_ -- exercise solution files which user uploaded and are associated with solution
+- _solutionRuntimeConfig_ -- runtime configuration which was used during execution on worker
+- _evaluated_ -- true if solution was evaluated and results were processed
 
 
 ## SolutionEvaluation
 
-- _evaluatedAt_ --
-- _initFailed_ --
-- _score_ --
-- _points_ --
-- _bonusPoints_ --
-- _isValid_ --
-- _evaluationFailed_ --
-- _resultYml_ --
-- _testResults_ --
+- _evaluatedAt_ -- datetime of evaluation creation
+- _initFailed_ -- if true then one of the initiation tasks failed thus solution cannot be even compiled
+- _score_ -- overall score of user solution
+- _points_ -- points which were assigned to user for this solution
+- _bonusPoints_ -- bonus points assigned by some of the supervisors
+- _isValid_ -- can be used to ban user solution of exercise due to various reasons
+- _evaluationFailed_ -- true if whole evaluation failed on worker
+- _resultYml_ -- whole YAML file with evaluation results acquired indirectly from worker
+- _testResults_ -- results of all tests associated with user solution
 
 ## SolutionFile
 
-- _solution_ --
+- _solution_ -- associated solution to which file belongs to
 
 ## SolutionRuntimeConfig