diff --git a/admin/api/exercice.go b/admin/api/exercice.go
index 50ffbfeb..442e4660 100644
--- a/admin/api/exercice.go
+++ b/admin/api/exercice.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -528,62 +529,36 @@ func updateExercice(c *gin.Context) {
 	c.JSON(http.StatusOK, ue)
 }
 
+type patchExercice struct {
+	Language    *string  `json:"lang,omitempty"`
+	Title       *string  `json:"title"`
+	Disabled    *bool    `json:"disabled"`
+	WIP         *bool    `json:"wip"`
+	URLId       *string  `json:"urlid"`
+	Statement   *string  `json:"statement"`
+	Overview    *string  `json:"overview"`
+	Headline    *string  `json:"headline"`
+	Finished    *string  `json:"finished"`
+	Issue       *string  `json:"issue"`
+	IssueKind   *string  `json:"issuekind"`
+	Gain        *int64   `json:"gain"`
+	Coefficient *float64 `json:"coefficient"`
+}
+
 func partUpdateExercice(c *gin.Context) {
 	exercice := c.MustGet("exercice").(*fic.Exercice)
 
-	var ue fic.Exercice
+	var ue patchExercice
 	err := c.ShouldBindJSON(&ue)
 	if err != nil {
 		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"errmsg": err.Error()})
 		return
 	}
 
-	if len(ue.Title) > 0 {
-		exercice.Title = ue.Title
-	}
-
-	if len(ue.URLId) > 0 {
-		exercice.URLId = ue.URLId
-	}
-
-	if len(ue.Statement) > 0 {
-		exercice.Statement = ue.Statement
-	}
-
-	if len(ue.Headline) > 0 {
-		exercice.Headline = ue.Headline
-	}
-
-	if len(ue.Finished) > 0 {
-		exercice.Finished = ue.Finished
-	}
-
-	if len(ue.Overview) > 0 {
-		exercice.Overview = ue.Overview
-	}
-
-	if len(ue.Issue) > 0 {
-		exercice.Issue = ue.Issue
-	}
-
-	if len(ue.IssueKind) > 0 {
-		exercice.IssueKind = ue.IssueKind
-	}
-
-	if ue.Depend != nil {
-		exercice.Depend = ue.Depend
-	}
-
-	if ue.Gain != 0 {
-		exercice.Gain = ue.Gain
-	}
-
-	if ue.Coefficient != 0 {
-		exercice.Coefficient = ue.Coefficient
-	}
-
-	if len(ue.VideoURI) > 0 {
-		exercice.VideoURI = ue.VideoURI
+	for _, field := range reflect.VisibleFields(reflect.TypeOf(ue)) {
+		if !reflect.ValueOf(ue).FieldByName(field.Name).IsNil() {
+			reflect.ValueOf(exercice).Elem().FieldByName(field.Name).Set(reflect.ValueOf(reflect.ValueOf(ue).FieldByName(field.Name).Elem().Interface()))
+		}
 	}
 
 	if _, err := exercice.Update(); err != nil {
diff --git a/admin/static/views/exercice-list.html b/admin/static/views/exercice-list.html
index 780c0b14..6046a9c5 100644
--- a/admin/static/views/exercice-list.html
+++ b/admin/static/views/exercice-list.html
@@ -74,9 +74,12 @@
 <form ng-submit="updateExercices()">
   <fieldset>
     <legend class="text-dark">Édition de masse <button type="submit" class="float-right btn btn-sm btn-success"><span class="glyphicon glyphicon-ok" aria-hidden="true"></span></button></legend>
-    <div class="form-group row" ng-class="{'row': field != 'disabled'}" ng-repeat="field in ['disabled','gain','coefficient','issue','issuekind']">
+    <p>
+      Les propriétés en gras seront écrasées.
+    </p>
+    <div ng-class="{'row': field != 'disabled', 'form-group': field != 'disabled', 'form-check': field == 'disabled'}" ng-repeat="field in ['disabled','gain','coefficient','issue','issuekind']">
       <input type="checkbox" class="form-check-input" id="{{ field }}" ng-model="exercice[field]" ng-if="field == 'disabled'">
-      <label for="{{ field }}" class="col-form-label-sm" ng-class="{'col-sm-1': field != 'disabled'}">{{ field | capitalize }}</label>
+      <label for="{{ field }}" class="col-form-label-sm" ng-class="{'col-sm-1': field != 'disabled', 'font-weight-bold': exercice[field] !== undefined}">{{ field | capitalize }}</label>
       <div class="col-sm-11" ng-if="field != 'disabled'">
 	<input type="text" class="form-control form-control-sm" id="{{ field }}" ng-model="exercice[field]" ng-if="field != 'statement' && field != 'issue' && field != 'issuekind' && field != 'overview' && field != 'depend' && field != 'gain' && field != 'coefficient'">
 	<input type="text" class="form-control form-control-sm" id="{{ field }}" ng-model="exercice[field]" ng-if="field == 'gain'" integer>