diff --git a/engine/vm.c b/engine/vm.c
index 9052a26..0b50283 100644
--- a/engine/vm.c
+++ b/engine/vm.c
@@ -8800,7 +8800,7 @@ static int vm_builtin_assert(ph7_context *pCtx, int nArg, ph7_value **apArg) {
 		SyString sChunk;
 		SyStringInitFromBuf(&sChunk, SyBlobData(&pAssert->sBlob), SyBlobLength(&pAssert->sBlob));
 		if(sChunk.nByte > 0) {
-			VmEvalChunk(pVm, pCtx, &sChunk, PH7_AERSCRIPT_CODE | PH7_AERSCRIPT_EXPR);
+			VmEvalChunk(pVm, pCtx, &sChunk, PH7_AERSCRIPT_CHNK | PH7_AERSCRIPT_EXPR);
 			/* Extract evaluation result */
 			iResult = ph7_value_to_bool(pCtx->pRet);
 		} else {
@@ -10299,7 +10299,7 @@ static int vm_builtin_eval(ph7_context *pCtx, int nArg, ph7_value **apArg) {
 		return SXRET_OK;
 	}
 	/* Eval the chunk */
-	VmEvalChunk(pCtx->pVm, &(*pCtx), &sChunk, PH7_AERSCRIPT_CODE);
+	VmEvalChunk(pCtx->pVm, &(*pCtx), &sChunk, PH7_AERSCRIPT_CHNK);
 	return SXRET_OK;
 }
 /*
diff --git a/include/ph7.h b/include/ph7.h
index 85e8f72..39dac42 100644
--- a/include/ph7.h
+++ b/include/ph7.h
@@ -422,14 +422,14 @@ typedef sxi64 ph7_int64;
 #define PH7_LIB_CONFIG_VFS                    6 /* ONE ARGUMENT: const ph7_vfs *pVfs */
 /*
  * Compile-time flags.
- * The new compile interfaces [ph7_compile_v2()] and [ph7_compile_file()] takes
- * as their last argument zero or more combination of compile time flags.
- * These flags are used to control the behavior of the PH7 compiler while
+ *
+ * VmEvalChunk and PH7_CompileAerScript takes iFlags argument
+ * which controls the behavior of the PH7 Engine while
  * processing the input.
- * Refer to the official documentation for additional information.
  */
-#define PH7_AERSCRIPT_CODE 0x01 /* PHP Block of Code */
-#define PH7_AERSCRIPT_EXPR 0x02 /* PHP Simple Expression */
+#define PH7_AERSCRIPT_CODE 0x01 /* AerScript Code */
+#define PH7_AERSCRIPT_CHNK 0x02 /* AerScript Chunk of Code */
+#define PH7_AERSCRIPT_EXPR 0x04 /* AerScript Expression */
 /*
  * Call Context Error Message Severity Level.
  *