diff --git a/rod/c2nim/manual.txt b/rod/c2nim/manual.txt
index 72c9d44da9..3aca188b41 100644
--- a/rod/c2nim/manual.txt
+++ b/rod/c2nim/manual.txt
@@ -234,6 +234,8 @@ Limitations
 
 * C's ``,`` operator (comma operator) is not supported.
 * C's ``union`` has no equivalent in Nimrod.
+* Standalone ``struct x {}`` declarations are not implemented. Put them into
+  a ``typedef``.
 * The condition in a ``do while(condition)`` statement must be ``0``.
 * Lots of other small issues...