diff --git a/src/i18n/locales/fr/fr.json b/src/i18n/locales/fr/fr.json
index bf082263..071a2d86 100644
--- a/src/i18n/locales/fr/fr.json
+++ b/src/i18n/locales/fr/fr.json
@@ -300,7 +300,8 @@
             "and": " et ",
             "end-alert": " se chevauchent.",
             "info": "Indiquez vos différentes occupations de la journée. Par défaut, votre première activité débute à 4h du matin.",
-            "lock": "Verrouiller le carnet"
+            "lock": "Verrouiller le carnet",
+            "locked-info": "Le carnet est verrouillé. Vous ne pouvez plus le modifier."
         },
         "secondary-activity": {
             "info-light": "Discuter, écouter de la musique, lire un article, regarder la télévision, manger, etc...",
diff --git a/src/pages/activity/activity-summary/ActivitySummary.tsx b/src/pages/activity/activity-summary/ActivitySummary.tsx
index 136468f5..c401d658 100644
--- a/src/pages/activity/activity-summary/ActivitySummary.tsx
+++ b/src/pages/activity/activity-summary/ActivitySummary.tsx
@@ -7,7 +7,7 @@ import {
     makeStylesEdt,
     TooltipInfo,
 } from "@inseefrlab/lunatic-edt";
-import { Box, Button, Divider, Switch, Typography } from "@mui/material";
+import { Box, Button, Divider, Switch, Tooltip, Typography } from "@mui/material";
 import { PDFDownloadLink } from "@react-pdf/renderer";
 import ErrorIcon from "../../../assets/illustration/error/activity.svg?react";
 import InfoAlertIcon from "../../../assets/illustration/info-alert.svg?react";
@@ -603,13 +603,17 @@ const ActivitySummaryPage = () => {
                     ))}
                 </Box>
                 <FlexCenter className={classes.addActivityOrRouteButtonBox}>
-                    <Button
-                        variant="contained"
-                        onClick={onOpenAddActivityOrRoute}
-                        disabled={!modifiable}
-                    >
-                        {t("page.activity-summary.add-activity-or-route")}
-                    </Button>
+                    <Tooltip title={!modifiable ? t("page.activity-planner.locked-info") : ""}>
+                        <span>
+                            <Button
+                                variant="contained"
+                                onClick={onOpenAddActivityOrRoute}
+                                disabled={!modifiable}
+                            >
+                                {t("page.activity-summary.add-activity-or-route")}
+                            </Button>
+                        </span>
+                    </Tooltip>
                 </FlexCenter>
                 <Divider variant="middle" flexItem />
                 {isSummaryEdited ? (
diff --git a/yarn.lock b/yarn.lock
index 2544f462..95afd459 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1202,10 +1202,10 @@
   dependencies:
     antlr4 "4.8.0"
 
-"@inseefrlab/lunatic-edt@^0.14.6":
-  version "0.14.6"
-  resolved "https://registry.yarnpkg.com/@inseefrlab/lunatic-edt/-/lunatic-edt-0.14.6.tgz#1994526ed7d699137cd6e19c740eb53cc796b6b2"
-  integrity sha512-1abnuK4IK9WMMw+t27d6SBYqHP02D8ewwq8BSD7RmxXDd1KiZZzs09lD1UVLGVEXPOP2yQ2hsKRk5lrsTRB5jQ==
+"@inseefrlab/lunatic-edt@^0.14.8":
+  version "0.14.8"
+  resolved "https://registry.yarnpkg.com/@inseefrlab/lunatic-edt/-/lunatic-edt-0.14.8.tgz#f3c07bf1bb9ca2fd04f4362980c54185fddab733"
+  integrity sha512-VKWgeMF0ZIvlrirWEWf3YeZkrEHYCO8qQTyxh2eRMy3IrGk+1RC7aSTwZ5s2+ZF5SfP2i7ZcJ2kjpltMDZ7Veg==
   dependencies:
     "@date-io/dayjs" "^2.16.0"
     "@emotion/react" "^11.10.4"