diff --git a/modules/field/field.module b/modules/field/field.module
index 52faf35..e12c3da 100644
--- a/modules/field/field.module
+++ b/modules/field/field.module
@@ -961,6 +961,12 @@ function field_has_data($field) {
 /**
  * Determine whether the user has access to a given field.
  *
+ * This method does not determine whether access is granted to the entity
+ * itself, only the specific field. Callers are responsible for ensuring that
+ * entity access is also respected, for example with the nodes, check
+ * node_access() before checking field_access() and with the Entity API
+ * contributed module check entity_access() before checking field_access().
+ *
  * @param $op
  *   The operation to be performed. Possible values:
  *   - 'edit'