diff --git a/admin/themes/default/template/picture_coi.tpl b/admin/themes/default/template/picture_coi.tpl
index 76d8ecc11..d5c2ec431 100644
--- a/admin/themes/default/template/picture_coi.tpl
+++ b/admin/themes/default/template/picture_coi.tpl
@@ -8,7 +8,7 @@
 <form method="post">
 
 <fieldset>
-<legend>{'Crop'|@translate}</legend>
+<legend>{'Photo sizes with crop'|@translate}</legend>
 {foreach from=$cropped_derivatives item=deriv}
 <img src="{$deriv.U_IMG}" alt="{$ALT}" {$deriv.HTM_SIZE}>
 {/foreach}
@@ -16,6 +16,12 @@
 
 <fieldset>
 <legend>{'Center of interest'|@translate}</legend>
+<p style="margin:0 0 10px 0;padding:0;">
+{'The center of interest is the most meaningful zone in the photo.'|@translate}
+{'For photo sizes with crop, such as "Square", Piwigo will do its best to include the center of interest.'|@translate}
+{'By default, the center of interest is placed in the middle of the photo.'|@translate}
+{'Select a zone with your mouse to define a new center of interest.'|@translate}
+</p>
 <input type="hidden" id="l" name="l" value="{if isset($coi)}{$coi.l}{/if}">
 <input type="hidden" id="t" name="t" value="{if isset($coi)}{$coi.t}{/if}">
 <input type="hidden" id="r" name="r" value="{if isset($coi)}{$coi.r}{/if}">
diff --git a/language/en_UK/admin.lang.php b/language/en_UK/admin.lang.php
index 79f16b331..c02e20a92 100644
--- a/language/en_UK/admin.lang.php
+++ b/language/en_UK/admin.lang.php
@@ -877,4 +877,9 @@ $lang['include photos with lower privacy level'] = 'include photos with lower pr
 $lang['custom']='Custom';
 $lang['No group is permitted to see this private album'] = 'No group is permitted to see this private album';
 $lang['Permission management'] = 'Permission management';
+$lang['Photo sizes with crop'] = 'Photo sizes with crop';
+$lang['The center of interest is the most meaningful zone in the photo.'] = 'The center of interest is the most meaningful zone in the photo.';
+$lang['For photo sizes with crop, such as "Square", Piwigo will do its best to include the center of interest.'] = 'For photo sizes with crop, such as "Square", Piwigo will do its best to include the center of interest.';
+$lang['By default, the center of interest is placed in the middle of the photo.'] = 'By default, the center of interest is placed in the middle of the photo.';
+$lang['Select a zone with your mouse to define a new center of interest.'] = 'Select a zone with your mouse to define a new center of interest.';
 ?>
\ No newline at end of file
diff --git a/language/fr_FR/admin.lang.php b/language/fr_FR/admin.lang.php
index 981fd4ec5..c915f51c1 100644
--- a/language/fr_FR/admin.lang.php
+++ b/language/fr_FR/admin.lang.php
@@ -891,4 +891,9 @@ $lang['%u users have automatic permission because they belong to a granted group
 $lang['include photos with lower privacy level'] = 'inclure les photos d\'un niveau de confidentialité inférieur';
 $lang['No group is permitted to see this private album'] = 'Aucun groupe n\'est autorisé à voir cet album privé';
 $lang['Permission management'] = 'Gestion des permissions';
+$lang['Photo sizes with crop'] = 'Tailles de photo avec retaillage';
+$lang['The center of interest is the most meaningful zone in the photo.'] = 'Le centre d\'intérêt est la zone la plus représentative de la photo.';
+$lang['For photo sizes with crop, such as "Square", Piwigo will do its best to include the center of interest.'] = 'Pour les tailles de photo avec retaillage, comme la taille "Carré", Piwigo essaiera d\'inclure au mieux ce centre d\'intérêt.';
+$lang['By default, the center of interest is placed in the middle of the photo.'] = 'Par défaut, le centre d\'intérêt est placé au milieu de la photo.';
+$lang['Select a zone with your mouse to define a new center of interest.'] = 'Sélectionnez une zone avec votre souris pour définir un nouveau centre d\'intérêt.';
 ?>
\ No newline at end of file