diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt b/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt
index f905445..fa0ed4d 100644
--- a/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt
@@ -12,6 +12,7 @@ import de.platon42.intellij.plugins.m68k.asm.M68kIsa.findSupportedOpSizes
 import de.platon42.intellij.plugins.m68k.psi.M68kAddressModeUtil.getAddressModeForType
 import de.platon42.intellij.plugins.m68k.psi.M68kAsmInstruction
 import de.platon42.intellij.plugins.m68k.psi.M68kSpecialRegisterDirectAddressingMode
+import de.platon42.intellij.plugins.m68k.utils.M68kIsaUtil
 
 class M68kSyntaxInspection : AbstractBaseM68kLocalInspectionTool() {
 
@@ -27,10 +28,7 @@ class M68kSyntaxInspection : AbstractBaseM68kLocalInspectionTool() {
         private const val UNSUPPORTED_ADDRESSING_MODE_FLIP_MSG_TEMPLATE = "Unsupported addressing modes for operands in this order for '%s'"
         private const val UNSUPPORTED_SIZE_UNSIZED_MSG_TEMPLATE = "Instruction '%s' is unsized"
         private const val UNSUPPORTED_SIZE_MSG_TEMPLATE = "Operation size '#ref' unsupported for '%s"
-        private const val UNSUPPORTED_SIZE_BYTE_MSG = "Operation size '#ref' unsupported (should be .b)"
-        private const val UNSUPPORTED_SIZE_WORD_MSG = "Operation size '#ref' unsupported (should be .w)"
-        private const val UNSUPPORTED_SIZE_LONG_MSG = "Operation size '#ref' unsupported (should be .l)"
-        private const val UNSUPPORTED_SIZE_WORD_OR_LONG_MSG = "Operation size '#ref' unsupported (should be .w or .l)"
+        private const val UNSUPPORTED_SIZE_HINT_MSG_TEMPLATE = "Operation size '#ref' unsupported (should be %s)"
     }
 
     override fun getDisplayName() = DISPLAY_NAME
@@ -147,38 +145,14 @@ class M68kSyntaxInspection : AbstractBaseM68kLocalInspectionTool() {
                             ProblemHighlightType.ERROR,
                             isOnTheFly
                         )
-                    OP_SIZE_B ->
+                    OP_SIZE_B, OP_SIZE_W, OP_SIZE_L, OP_SIZE_WL, OP_SIZE_SBW ->
                         manager.createProblemDescriptor(
                             asmOp.operandSize ?: asmOp,
-                            UNSUPPORTED_SIZE_BYTE_MSG,
+                            UNSUPPORTED_SIZE_HINT_MSG_TEMPLATE.format(M68kIsaUtil.findOpSizeDescription(supportedOpSizes)),
                             null as LocalQuickFix?, // TODO change size to .b?
                             ProblemHighlightType.ERROR,
                             isOnTheFly
                         )
-                    OP_SIZE_W ->
-                        manager.createProblemDescriptor(
-                            asmOp.operandSize ?: asmOp,
-                            UNSUPPORTED_SIZE_WORD_MSG,
-                            null as LocalQuickFix?, // TODO change size to .w?
-                            ProblemHighlightType.ERROR,
-                            isOnTheFly
-                        )
-                    OP_SIZE_L ->
-                        manager.createProblemDescriptor(
-                            asmOp.operandSize ?: asmOp,
-                            UNSUPPORTED_SIZE_LONG_MSG,
-                            null as LocalQuickFix?, // TODO change size to .l?
-                            ProblemHighlightType.ERROR,
-                            isOnTheFly
-                        )
-                    OP_SIZE_WL ->
-                        manager.createProblemDescriptor(
-                            asmOp.operandSize ?: asmOp,
-                            UNSUPPORTED_SIZE_WORD_OR_LONG_MSG,
-                            null as LocalQuickFix?,
-                            ProblemHighlightType.ERROR,
-                            isOnTheFly
-                        )
                     else ->
                         manager.createProblemDescriptor(
                             asmOp.operandSize ?: asmOp,
@@ -187,7 +161,6 @@ class M68kSyntaxInspection : AbstractBaseM68kLocalInspectionTool() {
                             ProblemHighlightType.ERROR,
                             isOnTheFly
                         )
-
                 }
             )
         }
diff --git a/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt b/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt
index 52bb715..409738b 100644
--- a/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt
+++ b/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt
@@ -73,7 +73,7 @@ internal class M68kSyntaxInspectionTest : AbstractInspectionTest() {
     internal fun shows_error_on_unsupported_op_size_for_w_or_l(@MyFixture myFixture: CodeInsightTestFixture) {
         myFixture.enableInspections(M68kSyntaxInspection::class.java)
         myFixture.configureByText("syntax.asm", " addq.b #5,a0")
-        assertHighlightings(myFixture, 1, "Operation size '.b' unsupported (should be .w or .l)")
+        assertHighlightings(myFixture, 1, "Operation size '.b' unsupported (should be .w|.l)")
     }
 
     @Test