diff --git a/lib/cartodb/middleware/coordinates.js b/lib/cartodb/middleware/coordinates.js
index d02b5624..43fa0fb6 100644
--- a/lib/cartodb/middleware/coordinates.js
+++ b/lib/cartodb/middleware/coordinates.js
@@ -12,7 +12,7 @@ module.exports = function coordinates (validate = { z: true, x: true, y: true })
             return next(err);
         }
 
-        // Negatives values for x param are valid. The x param is wrapped
+        // Negative values for x param are valid. The x param is wrapped
         if (validate.x && !integerNumber.test(x)) {
             const err = new Error(`Invalid coodinate 'x' value (${x}). It should be a number`);
             err.http_status = 400;