Update form_helper.rst
diff --git a/user_guide_src/source/helpers/form_helper.rst b/user_guide_src/source/helpers/form_helper.rst
index af266ff..9ddca89 100644
--- a/user_guide_src/source/helpers/form_helper.rst
+++ b/user_guide_src/source/helpers/form_helper.rst
@@ -571,7 +571,7 @@
// Would produce: </form> </div></div>
-.. php:function:: set_value($field[, $default = ''[,$html_escape = TRUE]])
+.. php:function:: set_value($field[, $default = ''[, $html_escape = TRUE]])
:param string $field: Field name
:param string $default: Default value