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-rw-r--r--doc/nimc.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/nimc.rst b/doc/nimc.rst
index 0346b98e9..4082b5378 100644
--- a/doc/nimc.rst
+++ b/doc/nimc.rst
@@ -143,6 +143,9 @@ which may be used in conjunction with the `compile time define
 pragmas<manual.html#implementation-specific-pragmas-compile-time-define-pragmas>`_
 to override symbols during build time.
 
+Compile time symbols are completely **case insensitive** and underscores are
+ignored too. ``--define:FOO`` and ``--define:foo`` are identical.
+
 
 Configuration files
 -------------------