diff --git a/Coding-Guidelines.md b/Coding-Guidelines.md
index a2b2aeb..0c629e2 100644
--- a/Coding-Guidelines.md
+++ b/Coding-Guidelines.md
@@ -1,3 +1,7 @@
 * Use the implicit "result" variable and try to avoid "return".
 * Do not use templates/macros when an inline proc suffices.
 * Do not use "nil" for strings and sequences. The procs of the standard library which misuse "nil" as an error value will be deprecated.
+
+# Indentation
+
+Convention is to use 2 spaces, however 4 spaces are also fine.
\ No newline at end of file