diff --git a/X86DisassemblerTests/TestData/not_tests.csv b/X86DisassemblerTests/TestData/not_tests.csv
index a85c84d..8d45fd5 100644
--- a/X86DisassemblerTests/TestData/not_tests.csv
+++ b/X86DisassemblerTests/TestData/not_tests.csv
@@ -19,6 +19,16 @@ F7D6;[{ "Type": "Not", "Operands": ["esi"] }]
 F7D7;[{ "Type": "Not", "Operands": ["edi"] }]
 
 # NOT with memory operands
-F61425;[{ "Type": "Not", "Operands": ["byte ptr [eax]"] }]
-F71425;[{ "Type": "Not", "Operands": ["dword ptr [eax]"] }]
-F7142510000000;[{ "Type": "Not", "Operands": ["dword ptr [eax+0x10]"] }]
+
+# SPECIAL CASE: When using SIB byte with Base=101 (EBP) and Mod=00, it requires a 32-bit displacement
+# The correct encoding for "NOT byte ptr [eax]" would be F610 (with Mod=00, R/M=0 for EAX)
+# F61425;[{ "Type": "Not", "Operands": ["byte ptr [eax]"] }]
+F610;[{ "Type": "Not", "Operands": ["byte ptr [eax]"] }]
+
+# The correct encoding for "NOT dword ptr [eax]" would be F710 (with Mod=00, R/M=0 for EAX)
+# F71425;[{ "Type": "Not", "Operands": ["dword ptr [eax]"] }]
+F710;[{ "Type": "Not", "Operands": ["dword ptr [eax]"] }]
+
+# The correct encoding for "NOT dword ptr [eax+0x10]" would be F75010 (with Mod=01, R/M=0 for EAX, disp8=0x10)
+# F7142510000000;[{ "Type": "Not", "Operands": ["dword ptr [eax+0x10]"] }]
+F75010;[{ "Type": "Not", "Operands": ["dword ptr [eax+0x10]"] }]