diff --git a/redmine/app/views/projects/calendar.rhtml b/redmine/app/views/projects/calendar.rhtml
index a42a95e4..fc62921d 100644
--- a/redmine/app/views/projects/calendar.rhtml
+++ b/redmine/app/views/projects/calendar.rhtml
@@ -69,3 +69,7 @@ end %>
 </td>
 </tr>
 </table>
+<br />
+<%= image_tag 'arrow_from' %>&nbsp;&nbsp;<%= l(:text_tip_task_begin_day) %><br />
+<%= image_tag 'arrow_to' %>&nbsp;&nbsp;<%= l(:text_tip_task_end_day) %><br />
+<%= image_tag 'arrow_bw' %>&nbsp;&nbsp;<%= l(:text_tip_task_begin_end_day) %><br />
\ No newline at end of file
diff --git a/redmine/lang/de.yml b/redmine/lang/de.yml
index 709ca18d..f05661e1 100644
--- a/redmine/lang/de.yml
+++ b/redmine/lang/de.yml
@@ -290,6 +290,9 @@ text_are_you_sure: Sind sie sicher ?
 text_journal_changed: geändert von %s zu %s
 text_journal_set_to: gestellt zu %s
 text_journal_deleted: gelöscht
+text_tip_task_begin_day: Aufgabe, die an diesem Tag beginnt
+text_tip_task_end_day: Aufgabe, die an diesem Tag beendet
+text_tip_task_begin_end_day: Aufgabe, die an diesem Tag beginnt und beendet
 
 default_role_manager: Manager
 default_role_developper: Developer
diff --git a/redmine/lang/en.yml b/redmine/lang/en.yml
index 27cc0260..38da60bc 100644
--- a/redmine/lang/en.yml
+++ b/redmine/lang/en.yml
@@ -290,6 +290,9 @@ text_are_you_sure: Are you sure ?
 text_journal_changed: changed from %s to %s
 text_journal_set_to: set to %s
 text_journal_deleted: deleted
+text_tip_task_begin_day: task beginning this day
+text_tip_task_end_day: task ending this day
+text_tip_task_begin_end_day: task beginning and ending this day
 
 default_role_manager: Manager
 default_role_developper: Developer
diff --git a/redmine/lang/es.yml b/redmine/lang/es.yml
index 654efd73..9baca2e9 100644
--- a/redmine/lang/es.yml
+++ b/redmine/lang/es.yml
@@ -290,6 +290,9 @@ text_are_you_sure: ¿ Estás seguro ?
 text_journal_changed: cambiado de %s a %s
 text_journal_set_to: fijado a %s
 text_journal_deleted: suprimido
+text_tip_task_begin_day: tarea que comienza este día
+text_tip_task_end_day: tarea que termina este día
+text_tip_task_begin_end_day: tarea que comienza y termina este día
 
 default_role_manager: Manager
 default_role_developper: Desarrollador
diff --git a/redmine/lang/fr.yml b/redmine/lang/fr.yml
index 5973f1d3..3196e9c1 100644
--- a/redmine/lang/fr.yml
+++ b/redmine/lang/fr.yml
@@ -291,6 +291,9 @@ text_are_you_sure: Etes-vous sûr ?
 text_journal_changed: changé de %s à %s
 text_journal_set_to: mis à %s
 text_journal_deleted: supprimé
+text_tip_task_begin_day: tâche commençant ce jour
+text_tip_task_end_day: tâche finissant ce jour
+text_tip_task_begin_end_day: tâche commençant et finissant ce jour
 
 default_role_manager: Manager
 default_role_developper: Développeur