diff --git a/Design.md b/Design.md
index b671c25..8ea4367 100644
--- a/Design.md
+++ b/Design.md
@@ -66,7 +66,31 @@ An example is Samhein which is typically November 1.
 
 ## 2. Database
 
+### Tables
 
+#### `loc`
+
+| Column Name | Type | Constraints? | Calculated? |
+| -- | - | - | --- |
+| loc_id | INT | PK,UNIQUE |  |
+| zip_code | STRING | UNIQUE |  |
+| lat | STRING |  |  |
+| long | STRING |  |  |
+
+#### `loc_weather`
+
+| Column Name | Type | Constraints? | Calculated? |
+| -- | - | - | --- |
+| loc_weather_id | INT | PK,UNIQUE |  |
+| loc_id | INT | FK |  |
+| weather_date | DATE |  |  |
+| isCurrent |  |  | `if weather_date >= sysdate then 'Y' else 'N' fi` |
+| isOld |  |      | `if weather_date < sysdate then 'Y' else 'N' fi` |
+| isExpired |  |  | `if weather_date < sysdate-7 then 'Y' else 'N' fi` |
+
+| Extra Constraints |
+| --- |
+| UNIQUE(loc_id, weather_date) |
 
 ### Description