diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..986e39d
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,34 @@
+Changelog
+=========
+
+## Unreleased
+- Nothing for now...
+
+## [5.3~ynh1](https://github.com/YunoHost-Apps/wordpress_ynh/pull/77) - 2019-12-26
+
+#### Fixed
+- [Get the database prefix before modifying data](https://github.com/YunoHost-Apps/wordpress_ynh/pull/77/commits/75d6e64c758443a06ca6bfd42a75291806618f03)
+
+#### Changed
+* [Upgrade to 5.3](https://github.com/YunoHost-Apps/wordpress_ynh/pull/77/commits/7d6f1e0048ebac0c1fef06a8789192f33a8220eb)
+- [Increase memory limit to support some plugin](https://github.com/YunoHost-Apps/wordpress_ynh/pull/77/commits/e5b1bb7e3449e9be49e9e60eaf3d986072a30f06)
+
+
+## [5.2~ynh1](https://github.com/YunoHost-Apps/wordpress_ynh/pull/65) - 2019-06-05
+
+#### Fixed
+- [Force upgrade with a cron](https://github.com/YunoHost-Apps/wordpress_ynh/pull/63/commits/7e4808ebc3318b3b6096729a28260fc936af4e78)
+
+#### Changed
+* [Upgrade to wordpress 5.2](https://github.com/YunoHost-Apps/wordpress_ynh/pull/63/commits/21b087ea6ebb499124745384771bfb0ddd866f11)
+- [Global upgrade of the package](https://github.com/YunoHost-Apps/wordpress_ynh/pull/64/commits/87e36e665c56dfbe110f44a35a4ccc9724e89a75)
+
+
+## [5.0.3~ynh1](https://github.com/YunoHost-Apps/wordpress_ynh/pull/56) - 2019-03-12
+
+#### Added
+- [Progress bar](https://github.com/YunoHost-Apps/wordpress_ynh/pull/56/commits/d140c510ea068f654ebefdd66c4e51ad3aa85067)
+
+#### Changed
+- [Update to last packaging standard](https://github.com/YunoHost-Apps/wordpress_ynh/pull/56/commits/bb64ee0d9b8883db13da35c252ed10899559f016)
+* [Update to wordpress 5.0.3](https://github.com/YunoHost-Apps/wordpress_ynh/pull/56/commits/04e76b93af5724fe23d19da2bc05e0f728398d43)
diff --git a/scripts/_common.sh b/scripts/_common.sh
index d3a9c43..6b6ed1f 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -245,3 +245,141 @@ ynh_maintenance_mode_OFF () {
 
 	systemctl reload nginx
 }
+
+#=================================================
+
+# Create a changelog for an app after an upgrade from the file CHANGELOG.md.
+#
+# usage: ynh_app_changelog [--format=markdown/html/plain] [--output=changelog_file] --changelog=changelog_source]
+# | arg: -f --format= - Format in which the changelog will be printed
+#       markdown: Default format.
+#       html:     Turn urls into html format.
+#       plain:    Plain text changelog
+# | arg: -o --output= - Output file for the changelog file (Default ./changelog)
+# | arg: -c --changelog= - CHANGELOG.md source (Default ../CHANGELOG.md)
+#
+# The changelog is printed into the file ./changelog and ./changelog_lite
+ynh_app_changelog () {
+    # Declare an array to define the options of this helper.
+    local legacy_args=foc
+    declare -Ar args_array=( [f]=format= [o]=output= [c]=changelog= )
+    local format
+    local output
+    local changelog
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    format=${format:-markdown}
+    output=${output:-changelog}
+    changelog=${changelog:-../CHANGELOG.md}
+
+    local original_changelog="$changelog"
+    local temp_changelog="changelog_temp"
+    local final_changelog="$output"
+
+    if [ ! -n "$original_changelog" ]
+    then
+        echo "No changelog available..." > "$final_changelog"
+        echo "No changelog available..." > "${final_changelog}_lite"
+        return 0
+    fi
+
+    local current_version=$(ynh_read_manifest --manifest="/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" --manifest_key="version")
+    local update_version=$(ynh_read_manifest --manifest="../manifest.json" --manifest_key="version")
+
+    # Get the line of the version to update to into the changelog
+    local update_version_line=$(grep --max-count=1 --line-number "^## \[$update_version" "$original_changelog" | cut -d':' -f1)
+    # If there's no entry for this version yet into the changelog
+    # Get the first available version
+    if [ -z "$update_version_line" ]
+    then
+        update_version_line=$(grep --max-count=1 --line-number "^##" "$original_changelog" | cut -d':' -f1)
+    fi
+
+    # Get the length of the complete changelog.
+    local changelog_length=$(wc --lines "$original_changelog" | awk '{print $1}')
+    # Cut the file before the version to update to.
+    tail --lines=$(( $changelog_length - $update_version_line + 1 )) "$original_changelog" > "$temp_changelog"
+
+    # Get the length of the troncated changelog.
+    changelog_length=$(wc --lines "$temp_changelog" | awk '{print $1}')
+    # Get the line of the current version into the changelog
+    # Keep only the last line found
+    local current_version_line=$(grep --line-number "^## \[$current_version" "$temp_changelog" | cut -d':' -f1 | tail --lines=1)
+    # If there's no entry for this version into the changelog
+    # Get the last available version
+    if [ -z "$current_version_line" ]
+    then
+        current_version_line=$(grep --line-number "^##" "$original_changelog" | cut -d':' -f1 | tail --lines=1)
+    fi
+    # Cut the file before the current version.
+    # Then grep the previous version into the changelog to get the line number of the previous version
+    local previous_version_line=$(tail --lines=$(( $changelog_length - $current_version_line )) \
+        "$temp_changelog" | grep --max-count=1 --line-number "^## " | cut -d':' -f1)
+    # If there's no previous version into the changelog
+    # Go until the end of the changelog
+    if [ -z "$previous_version_line" ]
+    then
+        previous_version_line=$changelog_length
+    fi
+
+    # Cut the file after the previous version to keep only the changelog between the current version and the version to update to.
+    head --lines=$(( $current_version_line + $previous_version_line - 1 )) "$temp_changelog" | tee "$final_changelog"
+
+    if [ "$format" = "html" ]
+    then
+        # Replace markdown links by html links
+        ynh_replace_string --match_string="\[\(.*\)\](\(.*\)))" --replace_string="<a href=\"\2\">\1</a>)" --target_file="$final_changelog"
+        ynh_replace_string --match_string="\[\(.*\)\](\(.*\))" --replace_string="<a href=\"\2\">\1</a>" --target_file="$final_changelog"
+    elif [ "$format" = "plain" ]
+    then
+        # Change title format.
+        ynh_replace_string --match_string="^##.*\[\(.*\)\](\(.*\)) - \(.*\)$" --replace_string="## \1 (\3) - \2" --target_file="$final_changelog"
+        # Change modifications lines format.
+        ynh_replace_string --match_string="^\([-*]\).*\[\(.*\)\]\(.*\)" --replace_string="\1 \2 \3" --target_file="$final_changelog"
+    fi
+    # else markdown. As the file is already in markdown, nothing to do.
+
+    # Keep only important changes into the changelog
+    # Remove all minor changes
+    sed '/^-/d' "$final_changelog" > "${final_changelog}_lite"
+    # Remove all blank lines (to keep a clear workspace)
+    sed --in-place '/^$/d' "${final_changelog}_lite"
+    # Add a blank line at the end
+    echo "" >> "${final_changelog}_lite"
+
+    # Clean titles if there's no significative changes
+    local line
+    local previous_line=""
+    while read line <&3
+    do
+        if [ -n "$previous_line" ]
+        then
+            # Remove the line if it's a title or a blank line, and the previous one was a title as well.
+            if ( [ "${line:0:1}" = "#" ] || [ ${#line} -eq 0 ] ) && [ "${previous_line:0:1}" = "#" ]
+            then
+                ynh_replace_special_string --match_string="${previous_line//[/.}" --replace_string="" --target_file="${final_changelog}_lite"
+            fi
+        fi
+        previous_line="$line"
+    done 3< "${final_changelog}_lite"
+
+    # Remove all blank lines again
+    sed --in-place '/^$/d' "${final_changelog}_lite"
+
+    # Restore changelog format with blank lines
+    ynh_replace_string --match_string="^##.*" --replace_string="\n\n&\n" --target_file="${final_changelog}_lite"
+    # Remove the 2 first blank lines
+    sed --in-place '1,2d' "${final_changelog}_lite"
+    # Add a blank line at the end
+    echo "" >> "${final_changelog}_lite"
+
+    # If changelog are empty, add an info
+    if [ $(wc --words "$final_changelog" | awk '{print $1}') -eq 0 ]
+    then
+        echo "No changes from the changelog..." > "$final_changelog"
+    fi
+    if [ $(wc --words "${final_changelog}_lite" | awk '{print $1}') -eq 0 ]
+    then
+        echo "No significative changes from the changelog..." > "${final_changelog}_lite"
+    fi
+}
diff --git a/scripts/upgrade b/scripts/upgrade
index 19f8e1c..7596a6a 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -269,6 +269,25 @@ ynh_script_progression --message="Disabling maintenance mode..." --weight=5
 
 ynh_maintenance_mode_OFF
 
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+
+# Get main domain and buid the url of the admin panel of the app.
+admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
+
+# Build the changelog
+ynh_app_changelog || true
+
+echo "If you're facing an issue or want to improve this app, please open a new issue in this __URL_TAG1__project__URL_TAG2__https://github.com/YunoHost-Apps/wordpress_ynh__URL_TAG3__.
+
+---
+
+Changelog since your last upgrade:
+$(cat changelog)" > mail_to_send
+
+ynh_send_readme_to_admin --app_message="mail_to_send" --recipients="$admin_wordpress" --type=upgrade
+
 #=================================================
 # END OF SCRIPT
 #=================================================