diff --git a/Facebook/command_line_cheat_sheet.md b/Facebook/command_line_cheat_sheet.md
index 9baaad5..951f185 100644
--- a/Facebook/command_line_cheat_sheet.md
+++ b/Facebook/command_line_cheat_sheet.md
@@ -36,3 +36,22 @@ ondemand devdb connect --name <name of the ephemeral xdb shard> | connect to dev
 SHOW DATABASES;                 |
 SHOW DATABASES LIKE 'open%';    |
 SHOW SCHEMAS;                   |
+
+
+# Systems
+|
+-|-
+*Data*                          |
+ ODS                            | tiem series (guts)
+ Scribe                         | log distributor
+ Scuba                          | data in more details (tabular)
+ uhaul                          | data permissining ??
+ Warm Storage                   | HDFS
+ presto                         | in memory
+ spark                          | 
+ hive                           | data store / query lang (use spark)
+ dataswarm                      | DAG
+ daiquery                       | simple queries
+ gigraph                        | graph queries
+*Real Time*                     |
+ puma                           | PQL