diff --git a/docs/code-style.rst b/docs/code-style.rst
index a5ed3c1..f282448 100644
--- a/docs/code-style.rst
+++ b/docs/code-style.rst
@@ -823,7 +823,7 @@
 instance breaking out of deeply nested structures) should goto be considered, and only if
 the alternative structured counterpart is proven to be less readable.
 
-3.20. "0" should be used instead of "NULL".
+3.20. ``nullptr`` should be used to represent a null pointer, instead of "0" or "NULL".
 
 3.21. Logical units within a block should be separated by one blank line.