diff --git a/docs/development/submitting-patches.rst b/docs/development/submitting-patches.rst
index 3eea1dd..c05f56d 100644
--- a/docs/development/submitting-patches.rst
+++ b/docs/development/submitting-patches.rst
@@ -123,6 +123,13 @@
     /* Bad */
     long f(int,char *)
 
+Use C-style ``/* */`` comments instead of C++-style ``//``:
+
+.. code-block:: c
+
+    // Bad
+    /* Good */
+
 Values set by ``#define`` should be assigned the appropriate type. If you see
 this: