diff --git a/README.md b/README.md
index 2b351db12..13dcf60a7 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,7 @@
 # studiomodelpp
-A modern C++ library for sanely parsing Valve's studiomodel formats
+A modern C++ library for sanely parsing Valve's studiomodel formats.
+
+Currently supports:
+- MDL v44-v49
+- VTX v7
+- VVD v4
diff --git a/src/structs/VTX.cpp b/src/structs/VTX.cpp
index 3938f86c8..d137217b8 100644
--- a/src/structs/VTX.cpp
+++ b/src/structs/VTX.cpp
@@ -9,6 +9,10 @@ bool VTX::open(const std::byte* data, std::size_t size, const MDL::MDL& mdl) {
 	BufferStream stream{data, size};
 
 	stream.read(this->version);
+	if (this->version != 7) {
+		return false;
+	}
+
 	stream.read(this->vertexCacheSize);
 	stream.read(this->maxBonesPerStrip);
 	stream.read(this->maxBonesPerTriangle);
diff --git a/src/structs/VVD.cpp b/src/structs/VVD.cpp
index c029de1c1..9b0ab6eab 100644
--- a/src/structs/VVD.cpp
+++ b/src/structs/VVD.cpp
@@ -16,6 +16,9 @@ bool VVD::open(const std::byte* data, std::size_t size, const MDL::MDL& mdl) {
 	}
 
 	stream.read(this->version);
+	if (this->version != 4) {
+		return false;
+	}
 
 	int checksum = stream.read<int>();
 	if (checksum != mdl.checksum) {