diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 50c5bd7989eb..198b879d61b5 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -3,6 +3,7 @@
 1. Rebase before opening a pull request
 2. If you are sending several unrelated fixes or features, use a branch and a separate pull request for each
 3. If possible try squashing everything in a single commit. This is particularly beneficial in the case of feature merges since it allows easy bisecting when a problem arises
+4. RetroArch codebase follows C89 coding rules for portability across many old platforms check using `C89_BUILD=1`
 
 ## Description