diff --git a/i18n/oc.json b/i18n/oc.json
index e539dcf..0484bb2 100644
--- a/i18n/oc.json
+++ b/i18n/oc.json
@@ -13,6 +13,7 @@
 	"math_notexvc": "L’executable « <code>texvc</code> » es introbable. Legissètz math/README per lo configurar.",
 	"math_sample": "Picatz vòstra formula aicí",
 	"math_syntax_error": "error de sintaxi",
+	"math-test-contains-diff": "La cadena renviada $1 conten pas la cadena esperada $2.",
 	"math_tip": "Formula matematica (LaTeX)",
 	"math-tracking-category-error": "Paginas amb errors dins balisas math",
 	"math_unknown_error": "error indeterminada",