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diff --git a/contributing.md b/contributing.md
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+++ b/contributing.md
@@ -22,6 +22,35 @@
 - When using libraries of which the header include order is important, make
   sure to separate the include statements using a blank line (clang-format may
   sort include statements, but does not sort across empty lines).
+- All engine-related code is implemented under the `crepe` namespace,
+  user-facing APIs under `crepe::api` (the folder structure should also reflect
+  this).
+- `using namespace` may not be used in header files, only in source files.
+- Do not (indirectly) include private dependency headers in API header files,
+  as these are no longer accessible when the engine is installed
+- Getter and setter functions are appropriately prefixed with `get_` and
+  `set_`.
+- Doxygen commands are used with a backslash instead of an at-sign (i.e.
+  `\brief` instead of `@brief`)
+- A singleton's instance is always accessed using a getter function that
+  instantiates its own class as a static variable within the getter function
+  scope, instead of storing the instance as a member variable directly:
+
+  ```cpp
+  class Bad {
+    static Bad instance;
+    Bad & get_instance() { return instance; }
+  };
+
+  class Good {
+    Good & get_instance() {
+      static Good instance;
+      return instance;
+    }
+  };
+  ```
+- Member variable default values should be directly defined in the class
+  declaration instead of using the constructor.
 
 ## CMakeLists specific