diff --git a/asm/ca65.inc b/asm/ca65.inc
new file mode 100644
index 0000000..ea07114
--- /dev/null
+++ b/asm/ca65.inc
@@ -0,0 +1,5 @@
+; http://www.cc65.org/doc/ca65-11.html#ss11.39
+.feature c_comments
+.feature labels_without_colons
+.feature leading_dot_in_identifiers
+