diff --git a/src/csv-loader/loader.ts b/src/csv-loader/loader.ts
index 4bac982..1d4012b 100644
--- a/src/csv-loader/loader.ts
+++ b/src/csv-loader/loader.ts
@@ -538,12 +538,13 @@ export interface ReverseReferenceDeclaration {
  */
 function parseReverseReferenceDeclaration(
   line: string,
+  commentChar: string = "#",
 ): ReverseReferenceDeclaration | null {
   const trimmed = line.trim();
-  // Must start with # (comment)
-  if (!trimmed.startsWith("#")) return null;
+  // Must start with the comment character
+  if (!trimmed.startsWith(commentChar)) return null;
 
-  const content = trimmed.slice(1).trim();
+  const content = trimmed.slice(commentChar.length).trim();
 
   // Match pattern: fieldName := ~tableName(foreignKey)
   const match = content.match(/^(\w+)\s*:=\s*~(\w+)\((\w+)\)(\?)?$/);
@@ -793,7 +794,9 @@ export function parseCsv(
     quote,
     escape,
     bom,
-    comment: undefined, // Don't let csv-parse skip comments; we need to parse them for reverse references
+    // Don't let csv-parse skip comments; we need to parse them for reverse references.
+    // Comment lines are filtered out manually below using the configured comment character.
+    comment: undefined,
     trim,
     skip_empty_lines: true,
     relax_column_count: true,
@@ -817,10 +820,10 @@ export function parseCsv(
   const dataRows: string[][] = [];
   for (let i = 2; i < records.length; i++) {
     const row = records[i];
-    // Check if this is a single-column row starting with # (comment with reverse ref declaration)
+    // Check if this is a comment line (starting with the configured comment character)
     const firstCell = (row[0] ?? "").trim();
-    if (firstCell.startsWith("#")) {
-      const decl = parseReverseReferenceDeclaration(firstCell);
+    if (comment && firstCell.startsWith(comment)) {
+      const decl = parseReverseReferenceDeclaration(firstCell, comment);
       if (decl) {
         reverseReferences.push(decl);
       }
@@ -834,8 +837,8 @@ export function parseCsv(
   // (in case they appear as schema cells rather than separate rows)
   for (let col = 0; col < schemas.length; col++) {
     const cell = (schemas[col] ?? "").trim();
-    if (cell.startsWith("#")) {
-      const decl = parseReverseReferenceDeclaration(cell);
+    if (comment && cell.startsWith(comment)) {
+      const decl = parseReverseReferenceDeclaration(cell, comment);
       if (decl) {
         reverseReferences.push(decl);
       }