diff --git a/1.sql b/1.sql
index 405d037..80c7aed 100644
--- a/1.sql
+++ b/1.sql
@@ -1 +1,2 @@
+-- write a SQL query to list the titles of all episodes in Cyberchase’s original season, Season 1.
 SELECT "title" FROM "episodes" WHERE "season" = 1;
diff --git a/2.sql b/2.sql
index f3c6942..97f1aaa 100644
--- a/2.sql
+++ b/2.sql
@@ -1 +1,2 @@
+-- list the season number of, and title of, the first episode of every season.
 SELECT "season", "title" FROM "episodes" WHERE "episode_in_season" = 1;
diff --git a/3.sql b/3.sql
index b4a0d94..b95f094 100644
--- a/3.sql
+++ b/3.sql
@@ -1 +1,2 @@
+-- find the production code for the episode “Hackerized!”.
 SELECT "production_code" FROM "episodes" WHERE "title" = "Hackerized!";
diff --git a/5.sql b/5.sql
index e69de29..b35ca85 100644
--- a/5.sql
+++ b/5.sql
@@ -0,0 +1,2 @@
+-- find the title of the holiday episode that aired on December 31st, 2004.
+SELECT "title" FROM "episodes" WHERE "air_date" = "2004-12-31";