diff --git a/ext/pdf/pdf.c b/ext/pdf/pdf.c
index 9210e9a3faa..eb07fc4c3b0 100644
--- a/ext/pdf/pdf.c
+++ b/ext/pdf/pdf.c
@@ -2523,7 +2523,7 @@ PHP_FUNCTION(pdf_close_image) {
 }
 /* }}} */
 
-/* {{{ proto void pdf_place_image(int pdf, int pdfimage, int x, int y, int scale)
+/* {{{ proto void pdf_place_image(int pdf, int pdfimage, double x, double y, double scale)
    Places image in the pdf document */
 PHP_FUNCTION(pdf_place_image) {
 	pval *arg1, *arg2, *arg3, *arg4, *arg5;