diff --git a/docs/ProjectFormat.md b/docs/ProjectFormat.md
index 9f695dad3..0618cce5f 100644
--- a/docs/ProjectFormat.md
+++ b/docs/ProjectFormat.md
@@ -114,6 +114,18 @@ The identifier of the protection/packer.
 The arguments that passed to the protection.
 Optional.
 
+Element `argument`
+------------------
+
+An argument that is passed to a protection.
+
+**Attributes:**
+
+`name`:
+The name of the argument.
+
+`value`:
+The value of the argument.
 
 Applying rules
 --------------
@@ -138,4 +150,4 @@ Here are some example expressions:
 
 Examples
 ----------------
-ConfuserEx projects that work for ILSpy and PaintDotNet can be found under `additional` directory as examples.
\ No newline at end of file
+ConfuserEx projects that work for ILSpy and PaintDotNet can be found under `additional` directory as examples.