diff --git a/README.md b/README.md
index 166597e..34d2594 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,9 @@ By contributing you agree to license your contribution under the terms of the GP
 GPLv3: <http://www.gnu.org/licenses/gpl-3.0.txt>
 
 CC-BY 4.0: <https://github.com/twitter/twemoji/blob/gh-pages/LICENSE-GRAPHICS>
+
+## Contributing
+When submitting PRs keep the following in mind please:
+
+- only submit SVGs.
+- don't have spaces in your file names. Use underscore_case or camelCase instead.