diff --git a/nvim/spell/en.utf-8.add b/nvim/spell/en.utf-8.add
index 24244e1..f19e3c3 100644
--- a/nvim/spell/en.utf-8.add
+++ b/nvim/spell/en.utf-8.add
@@ -2,3 +2,4 @@ NeoVim
 config
 Supremum
 Infimum
+iff
diff --git a/nvim/spell/en.utf-8.add.spl b/nvim/spell/en.utf-8.add.spl
index 4a14882..71dea35 100644
Binary files a/nvim/spell/en.utf-8.add.spl and b/nvim/spell/en.utf-8.add.spl differ
diff --git a/nvim/util/verible-conf.json b/nvim/util/verible-conf.json
new file mode 100644
index 0000000..7cd68b1
--- /dev/null
+++ b/nvim/util/verible-conf.json
@@ -0,0 +1,11 @@
+{
+    "no_empty_module": "warn",
+    "no_unreachable": "error",
+    "no_default_parameter": "info",
+    "no_implicit_parameter": "warn",
+    "no_define_with_no_value": "error",
+    "no_unused_variable": "error",
+    "no_multiple_define": "error",
+    "no_redundant_define": "warn",
+    "no_trailing_spaces": "off"
+}