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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -191,6 +191,16 @@ last tested using Eigen version 3.3.3.)
 More information on source code, dependencies and installation can be
 found in [INSTALL.md](INSTALL.md).
 
+## Contributing
+
+GEMMA uses the [LLVM style](http://llvm.org/docs/CodingStandards.html)
+for C++ code.  You should set your editor to replace tabs with spaces
+and 2 spaces of indentation. Use
+
+    clang-format -style=LLVM -i *.cpp *.h
+
+to validate the coding style.
+
 ## Credits
 
 The *GEMMA* software was developed by: