diff --git a/sql/setup.sql b/sql/setup.sql
index c3794de..5038925 100644
--- a/sql/setup.sql
+++ b/sql/setup.sql
@@ -1803,12 +1803,17 @@ CREATE TABLE blends_dependencies (
 
 GRANT SELECT ON blends_dependencies TO PUBLIC;
 
+-- This table's data is used to properly generate the task-description file for a Blend
+-- Tasksel doesn't allow boolean(eg OR : |) comparisons in dependencies such as package1 | package2. 
+-- In these cases we need to know which packages, from the blends_dependencies table, are the alternatives between them
+-- in order to include only one package (the first available) from a group of alternatives in the task-description file.
 DROP TABLE IF EXISTS blends_dependencies_alternatives;
 CREATE TABLE blends_dependencies_alternatives (
   -- fieldname    type,
      blend        TEXT REFERENCES blends_metadata,
      task         TEXT,
      alternatives TEXT, -- content is in format: package1 | package2 | package3 ...
+     dependency   CHARACTER(1) CHECK (dependency IN ('d', 'i', 'r', 's', 'a')), -- Depends / Ignore / Recommends / Suggests / Avoid
      PRIMARY KEY (blend, task)
 );