diff --git a/README.md b/README.md
index 5ba8ab338..a00d6f540 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
STScI Calibration algorithms and tools.
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+
> [!IMPORTANT]
> Linux and MacOS platforms are tested and supported. Windows is not currently supported.