diff --git a/lib/php/rendition-factory/src/Transformer/Document/DocumentToPdfTransformerModule.php b/lib/php/rendition-factory/src/Transformer/Document/DocumentToPdfTransformerModule.php
index aca969671..27fea2c9e 100644
--- a/lib/php/rendition-factory/src/Transformer/Document/DocumentToPdfTransformerModule.php
+++ b/lib/php/rendition-factory/src/Transformer/Document/DocumentToPdfTransformerModule.php
@@ -28,7 +28,7 @@ public function getDocumentation(): Documentation
         return new Documentation(
             $treeBuilder,
             <<<HEADER
-            Convert any document to pdf format.
+            Convert any document to PDF format.
             HEADER
         );
     }
diff --git a/lib/php/rendition-factory/src/Transformer/Document/PdfToImageTransformerModule.php b/lib/php/rendition-factory/src/Transformer/Document/PdfToImageTransformerModule.php
index b0c19530a..b265e7eae 100644
--- a/lib/php/rendition-factory/src/Transformer/Document/PdfToImageTransformerModule.php
+++ b/lib/php/rendition-factory/src/Transformer/Document/PdfToImageTransformerModule.php
@@ -29,7 +29,7 @@ public function getDocumentation(): Documentation
         return new Documentation(
             $treeBuilder,
             <<<HEADER
-            Convert the first page of the pdf to an image.
+            Convert the first page of a PDF to an image.
             HEADER
         );
     }