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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 e750a5b12..a7cee7f59 100644
--- a/doc/nimc.rst
+++ b/doc/nimc.rst
@@ -144,6 +144,9 @@ 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.
 
+Compile time symbols starting with the ``nim`` prefix are reserved for the
+implementation and should not be used elsewhere.
+
 
 Configuration files
 -------------------