diff --git a/README.md b/README.md
index 388c248..8ee4b56 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,17 @@ schedule tasks and help you stay in touch with your contacts.
 
 For more information, visit the the main [Alas
 website](https://www.hackberry.dev/alas/).
+
+## Development
+
+Install dependencies with:
+
+```sh
+jpm deps
+```
+
+Run tests with:
+
+```sh
+jpm test
+```
diff --git a/TODO.md b/TODO.md
deleted file mode 100644
index 4640904..0000000
--- a/TODO.md
+++ /dev/null
@@ -1 +0,0 @@
-# TODO
diff --git a/src/commands/schedule_tasks.janet b/src/commands/schedule_tasks.janet
index 1ea9506..c8f656c 100644
--- a/src/commands/schedule_tasks.janet
+++ b/src/commands/schedule_tasks.janet
@@ -9,6 +9,7 @@
 (import ../file_repository)
 (import ../schedule_parser)
 
+(def command "--schedule-tasks")
 (def weekdays ["Monday" "Tuesday" "Wednesday" "Thursday" "Friday"])
 
 (defn- remove-year [formatted-date]
@@ -48,6 +49,9 @@
           (task/mark-as-missed task (day :date))))
        tasks))
 
+(defn- format-parse-errors [errors]
+  (map (fn [error] (string command " " (string/ascii-lower error) ".")) errors))
+
 ## —————————————————————————————————————————————————————————————————————————————————————————————————
 ## Public Interface
 
@@ -70,12 +74,10 @@
     (let [load-file-result (file_repository/load argument)
           error (load-file-result :error)]
       (if error
-        {:errors [(string "--schedule-tasks " (string/ascii-lower error))]}
-        (let [parse-result (schedule_parser/parse (load-file-result :text))]
-          (if parse-result
-            (let [schedule (first parse-result)]
-              (if (empty? schedule)
-                {:errors ["--schedule-tasks schedule is empty."]}
-                {:command [schedule-tasks (first parse-result) (date/today)]}))
-            {:errors ["--schedule-tasks schedule could not be parsed."]}))))
+        {:errors [(string command " " (string/ascii-lower error))]}
+        (let [parse-result (schedule_parser/parse (load-file-result :text))
+              errors (parse-result :errors)]
+          (if errors
+            {:errors (format-parse-errors errors)}
+            {:command [schedule-tasks (parse-result :tasks) (date/today)]}))))
     {}))
diff --git a/src/schedule_parser.janet b/src/schedule_parser.janet
index 89880b8..2fe17e1 100644
--- a/src/schedule_parser.janet
+++ b/src/schedule_parser.janet
@@ -17,7 +17,16 @@
 
 (defn parse
   ```
-  Parses schedule string and returns an array of task entities.
+  Parses schedule-string and returns a tuple:
+
+  - {:tasks tasks}    Where tasks is an array of task entities, when parsing was successfull.
+  - {:errors errors}  Where errors is an array of strings.
   ```
   [schedule-string]
-  (peg/match schedule-grammar schedule-string))
+  (let [parse-result (peg/match schedule-grammar schedule-string)]
+    (if parse-result
+      (let [tasks (first parse-result)]
+        (if (empty? tasks)
+          {:errors ["Schedule is empty"]}
+          {:tasks tasks}))
+      {:errors ["Schedule can not be parsed"]})))
diff --git a/test/commands/schedule_tasks_test.janet b/test/commands/schedule_tasks_test.janet
index 2768bbb..d191ad6 100644
--- a/test/commands/schedule_tasks_test.janet
+++ b/test/commands/schedule_tasks_test.janet
@@ -199,7 +199,7 @@
   (def arguments {"schedule-tasks" "test/examples/unparsable-schedule.md"})
   (def result (build-command arguments))
   (is (nil? (result :command)))
-  (is (= "--schedule-tasks schedule could not be parsed." (first (result :errors)))))
+  (is (= "--schedule-tasks schedule can not be parsed." (first (result :errors)))))
 
 (deftest build-command-when-schedule-is-empty
   (def arguments {"schedule-tasks" "test/examples/empty-schedule.md"})
diff --git a/test/examples/schedule-without-date.md b/test/examples/schedule-without-date.md
new file mode 100644
index 0000000..92e37aa
--- /dev/null
+++ b/test/examples/schedule-without-date.md
@@ -0,0 +1,7 @@
+# Scheduled Tasks
+
+- Weekly Meeting (every Tuesday)
+- Deploy the web app (every weekday)
+- Pay football practice
+- Martha's birthsday (every 05-24)
+- Meeting with Jack (on 2022-05-03)
diff --git a/test/schedule_parser_test.janet b/test/schedule_parser_test.janet
index 05dc5c8..0f8419c 100644
--- a/test/schedule_parser_test.janet
+++ b/test/schedule_parser_test.janet
@@ -2,6 +2,9 @@
 (import ../src/date :as d)
 (import ../src/schedule_parser)
 
+## —————————————————————————————————————————————————————————————————————————————————————————————————
+## Test parse-schedule
+
 (deftest parse-schedule
   (def schedule-string
     ```
@@ -11,10 +14,11 @@
     - Puzzle Storm on Lichess (every day)
     - Deploy the web app (every weekday)
     - Pay football practice (every month)
-    - Martha's birthsday (every 05-24)
+    - Martha's birthday (every 05-24)
     - Meeting with Jack (on 2022-05-03)
     ```)
-  (def scheduled-tasks (first (schedule_parser/parse schedule-string)))
+  (def result (schedule_parser/parse schedule-string))
+  (def scheduled-tasks (result :tasks))
   (is (= 6 (length scheduled-tasks)))
   (let [task (scheduled-tasks 0)]
     (is (= "Weekly Meeting" (task :title)))
@@ -29,4 +33,22 @@
     (is (= false (task :done)))
     (is (= "on 2022-05-03" (task :schedule)))))
 
+(deftest parse-schedule-when-schedule-can-not-be-parsed
+  (def schedule-string
+    ```
+    ## Schedule
+
+    * One (always)
+    ```)
+  (def result (schedule_parser/parse schedule-string))
+  (is (= "Schedule can not be parsed" (first (result :errors)))))
+
+(deftest parse-schedule-when-schedule-is-empty
+  (def schedule-string
+    ```
+    # Scheduled Tasks
+    ```)
+  (def result (schedule_parser/parse schedule-string))
+  (is (= "Schedule is empty" (first (result :errors)))))
+
 (run-tests!)