diff --git a/descriptions/SDK.NVIDIA_Cg.md b/descriptions/SDK.NVIDIA_Cg.md
new file mode 100644
index 000000000..6a4e38582
--- /dev/null
+++ b/descriptions/SDK.NVIDIA_Cg.md
@@ -0,0 +1 @@
+The [Cg Toolkit](https://developer.nvidia.com/cg-toolkit) is a legacy NVIDIA shading toolkit no longer supported.
diff --git a/rules.ini b/rules.ini
index 57e63f556..ecfde94c1 100644
--- a/rules.ini
+++ b/rules.ini
@@ -256,6 +256,7 @@ NodeJS = (?:^|/)node\.dll$
 NvCloth = (?:^|/)NvCloth(?:profile)?_x(?:64|86)\.dll$
 NVIDIA_Ansel = (?:^|/)AnselSDK(?:32|64)\.dll$
 NVIDIA_APEX = (?:^|/)apex(?:framework|_framework|_loader|_release)
+NVIDIA_Cg = (?:^|/)cg(?:GL|D3D(?:9|1[01]))?.dll$
 NVIDIA_DLSS = (?:^|/)(?:sl\.|nvngx_)dlss\.dll$
 NVIDIA_DLSS_FrameGen = (?:^|/)(?:sl\.dlss_g|nvngx_dlssg)\.dll$
 NVIDIA_FleX = (?:^|/)flexRelease_x(?:64|86)\.dll$
diff --git a/tests/types/SDK.NVIDIA_Cg.txt b/tests/types/SDK.NVIDIA_Cg.txt
new file mode 100644
index 000000000..01b62bc5e
--- /dev/null
+++ b/tests/types/SDK.NVIDIA_Cg.txt
@@ -0,0 +1,10 @@
+/cg.dll
+/cgGL.dll
+/cgD3D11.dll
+/cgD3D10.dll
+/cgD3D9.dll
+cg.dll
+cgGL.dll
+cgD3D11.dll
+cgD3D10.dll
+cgD3D9.dll