diff --git a/README.md b/README.md
index 0365d8d..80976f7 100644
--- a/README.md
+++ b/README.md
@@ -498,10 +498,10 @@ checking tool (https://reuse.software/). See the `.reuse` subdirectory.
 External Tool Links
 -------------------
 
-- [Online .EXR and .HDR Image File Viewer](https://viewer.openhdr.org/) - With strong tone mapping, auto-exposure, HDR histogram
+- [Online .EXR and .HDR Image File Viewer](https://viewer.openhdr.org/) - With strong tone mapping, auto-exposure, HDR histogram.
 - [Windows HDR + WCG Image Viewer](https://13thsymphony.github.io/hdrimageviewer/) - A true HDR image viewer for Windows which works on HDR monitors. Also see [the github repo](https://github.com/13thsymphony/HDRImageViewer).
-- [AMD Compressonator](https://gpuopen.com/compressonator/) - Can view .KTX files in some formats
-- [PVRTexTool](https://www.imgtec.com/developers/powervr-sdk-tools/pvrtextool/) - Can view .ASTC and .KTX files in some formats
+- [AMD Compressonator](https://gpuopen.com/compressonator/) - .DDS viewer, can view .KTX files in some formats.
+- [PVRTexTool](https://www.imgtec.com/developers/powervr-sdk-tools/pvrtextool/) - Can view .ASTC and .KTX files in some formats. (Note: .DDS viewer seems busted for BC1, doesn't support BC7 at all.)
 - [Microsoft's DirectXTex](https://github.com/microsoft/DirectXTex) - Samples contain a basic .DDS viewer. (Note: May still have issues loading .DDS files with texture dimensions that aren't divisible by 4 texels.)
 - [RenderDoc](https://renderdoc.org/) - Can view LDR/HDR .DDS files in BC1-7 formats.
 - [Mali Texture Compression Tool](https://community.arm.com/support-forums/f/graphics-gaming-and-vr-forum/52390/announcement-mali-texture-compression-tool-end-of-life) - Now deprecated.