diff --git a/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java b/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java
index 785be0b15..58e5b848c 100644
--- a/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java
+++ b/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java
@@ -146,8 +146,8 @@ public class CertSignController {
             summary = "Sign PDF with a Digital Certificate",
             description =
                     "This endpoint accepts a PDF file, a digital certificate and related"
-                            + " information to sign the PDF. It then returns the digitally signed PDF"
-                            + " file. Input:PDF Output:PDF Type:SISO")
+                        + " information to sign the PDF. It then returns the digitally signed PDF"
+                        + " file. Input:PDF Output:PDF Type:SISO")
     public ResponseEntity<byte[]> signPDFWithCert(@ModelAttribute SignPDFWithCertRequest request)
             throws Exception {
         MultipartFile pdf = request.getFileInput();
@@ -161,6 +161,7 @@ public class CertSignController {
         String reason = request.getReason();
         String location = request.getLocation();
         String name = request.getName();
+        // Convert 1-indexed page number (user input) to 0-indexed page number (API requirement)
         Integer pageNumber = request.getPageNumber() != null ? (request.getPageNumber() - 1) : null;
         Boolean showLogo = request.getShowLogo();