From 50b3d59b79f815166afd27deb43d6c2862d3f42f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?H=C3=A5kon=20H=C3=A6gland?= <hakon.hagland@gmail.com>
Date: Fri, 19 Sep 2025 10:50:47 +0200
Subject: [PATCH] Correct include order
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Fix include file order: local → OPM modules → external → system headers last
---
 CONTRIBUTING.md | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c5d9ecbabb..25bf639dd5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -97,29 +97,29 @@ This ensures your functional changes aren't obscured by formatting changes elsew
 
 Organize `#include` directives in the following order, with blank lines between groups:
 
-1. **System headers** (C standard library, C++ STL):
+1. **Local OPM headers** (from this module):
    ```cpp
-   #include <algorithm>
-   #include <cmath>
-   #include <iostream>
+   #include <opm/models/common/multiphasebaseproperties.hh>
+   #include <opm/models/flash/flashproperties.hh>
    ```
 
-2. **External library headers** (Dune, etc.):
-   ```cpp
-   #include <dune/common/fmatrix.hh>
-   #include <dune/common/fvector.hh>
-   ```
-
-3. **OPM headers from other modules**:
+2. **OPM headers from other modules**:
    ```cpp
    #include <opm/common/Exceptions.hpp>
    #include <opm/material/Constants.hpp>
    ```
 
-4. **Local OPM headers** (from this module):
+3. **External library headers** (Dune, etc.):
    ```cpp
-   #include <opm/models/common/multiphasebaseproperties.hh>
-   #include <opm/models/flash/flashproperties.hh>
+   #include <dune/common/fmatrix.hh>
+   #include <dune/common/fvector.hh>
+   ```
+
+4. **System headers** (C standard library, C++ STL):
+   ```cpp
+   #include <algorithm>
+   #include <cmath>
+   #include <iostream>
    ```
 
 Within each group, maintain **alphabetical order**.