1 files changed, 1 insertions, 0 deletions

diff --git a/style.md b/style.md
index 7e6b9b6..3cbe9b8 100644
--- a/style.md
+++ b/style.md
@@ -50,4 +50,5 @@ before formatting as a failsafe.
 - use lower case keywords
 - testbench name is the component name with `_tb` as suffix
 - vhdl filename is the same as the component name
+- vhdl files should end in the `.vhd` file extension, not `.vhdl`