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-rw-r--r--docs/contributing.md1
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diff --git a/docs/contributing.md b/docs/contributing.md
index 8242cc1adc..7ed7cd06a5 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -70,6 +70,7 @@ Most of our style is pretty easy to pick up on, but right now it's not entirely
* Do not write obvious comments
* If you not sure if a comment is obvious, go ahead and include it.
* In general we don't wrap lines, they can be as long as needed. If you do choose to wrap lines please do not wrap any wider than 76 columns.
+* We use `#pragma once` at the start of header files rather than old-style include guards (`#ifndef THIS_FILE_H`, `#define THIS_FILE_H`, ..., `#endif`)
# General Guidelines