diff --git a/Graphics-Driver-Issues.md b/Graphics-Driver-Issues.md
index 8d82b61..610d9a4 100644
--- a/Graphics-Driver-Issues.md
+++ b/Graphics-Driver-Issues.md
@@ -11,6 +11,7 @@ This page quickly summarizes graphics driver quirks and issues present in GPU dr
 ### AMD (proprietary)
 **OpenGL.**
 - glMultiDrawArrays is broken. Workaround implemented and problem reported to AMD. No replies yet.
+  [NOTE] This seems to be undefined behavior in the spec. The gl_VertexID propagation behavior across MultiDrawArrays is not defined, i.e whether it should continue incrementing of reset to 0 on a new instance. However, due to the comparison with a loop of [first, count] and implied functional equivalence, this may be interpreted as a bug. Either way, RPCS3 provides a workaround using index lookups.
 - ~~glGetTexImage/glGetTextureImage/glGetTextureImageEXT do not work with immutable textures if pack/unpack byteswap is requested. Workaround implemented.~~ Fixed in driver version 19.4.3
 
 **Vulkan.**