diff --git a/decode-test.c b/decode-test.c
index 030b738..3e27ee3 100644
--- a/decode-test.c
+++ b/decode-test.c
@@ -408,6 +408,10 @@ main(int argc, char** argv)
     TEST64("\xf3\x0f\x09", "wbnoinvd");
     TEST32("\x66\x0f\x38\x82\x01", "invpcid eax, xmmword ptr [ecx]");
     TEST64("\x66\x0f\x38\x82\x01", "invpcid rax, xmmword ptr [rcx]");
+    TEST32("\x66\x0f\x38\x80\x02", "invept eax, xmmword ptr [edx]");
+    TEST64("\x66\x0f\x38\x80\x02", "invept rax, xmmword ptr [rdx]");
+    TEST32("\x66\x0f\x38\x81\x02", "invvpid eax, xmmword ptr [edx]");
+    TEST64("\x66\x0f\x38\x81\x02", "invvpid rax, xmmword ptr [rdx]");
     TEST32("\x66\x0f\x38\xf8\x01", "movdir64b eax, zmmword ptr [ecx]");
     TEST64("\x66\x0f\x38\xf8\x01", "movdir64b rax, zmmword ptr [rcx]");
     // TODO: MOVDIR64B first operand has address size.
diff --git a/instrs.txt b/instrs.txt
index 8cb6141..a76e341 100644
--- a/instrs.txt
+++ b/instrs.txt
@@ -1483,8 +1483,8 @@ F3.0fa7e0              NP   -   -   -   -   REP_XCRYPTCFB       F=PADLOCK ONLYVI
 F3.0fa7e8              NP   -   -   -   -   REP_XCRYPTOFB       F=PADLOCK ONLYVIA
 
 # VMX
-66.0f3880/m            RM   Gy  M   -   -   INVEPT          D64 F=VMX
-66.0f3881/m            RM   Gy  M   -   -   INVVPID         D64 F=VMX
+66.0f3880/m            RM   Gy  Mdq -   -   INVEPT          D64 F=VMX
+66.0f3881/m            RM   Gy  Mdq -   -   INVVPID         D64 F=VMX
 NP.0f01c1              NP   -   -   -   -   VMCALL              F=VMX
 66.0fc7/6m             M    Mq  -   -   -   VMCLEAR             F=VMX
 NP.0f01d4              NP   -   -   -   -   VMFUNC              F=VMX