diff --git a/doc/en/weechat_plugin_api.en.txt b/doc/en/weechat_plugin_api.en.txt
index 896337401..1d58c6a3a 100644
--- a/doc/en/weechat_plugin_api.en.txt
+++ b/doc/en/weechat_plugin_api.en.txt
@@ -556,7 +556,7 @@ C example:
 [source,C]
 ----------------------------------------
 char *str = "AbCdé";
-weechat_string_tolower (str); /* str is now: "ABCDé" */
+weechat_string_toupper (str); /* str is now: "ABCDé" */
 ----------------------------------------
 
 [NOTE]
diff --git a/doc/fr/weechat_plugin_api.fr.txt b/doc/fr/weechat_plugin_api.fr.txt
index f781ad6aa..7063a7e73 100644
--- a/doc/fr/weechat_plugin_api.fr.txt
+++ b/doc/fr/weechat_plugin_api.fr.txt
@@ -563,7 +563,7 @@ Exemple en C :
 [source,C]
 ----------------------------------------
 char *str = "AbCdé";
-weechat_string_tolower (str); /* str vaut maintenant : "ABCDé" */
+weechat_string_toupper (str); /* str vaut maintenant : "ABCDé" */
 ----------------------------------------
 
 [NOTE]
diff --git a/doc/it/weechat_plugin_api.it.txt b/doc/it/weechat_plugin_api.it.txt
index 45fecbe45..20e2aa66f 100644
--- a/doc/it/weechat_plugin_api.it.txt
+++ b/doc/it/weechat_plugin_api.it.txt
@@ -572,7 +572,7 @@ Esempio in C:
 [source,C]
 ----------------------------------------
 char *str = "AbCdé";
-weechat_string_tolower (str); /* str ora è: "ABCDé" */
+weechat_string_toupper (str); /* str ora è: "ABCDé" */
 ----------------------------------------
 
 [NOTE]