diff --git a/documentation/Mar345Doc.html b/documentation/Mar345Doc.html
index d084a48..ec0ccd2 100755
--- a/documentation/Mar345Doc.html
+++ b/documentation/Mar345Doc.html
@@ -147,7 +147,7 @@
           must be "%3.3d". If they are not then mar345dtb will successfully save the file,
           but with a different name than the areaDetector driver was expecting it to use,
           and the driver will generate an error when it tries to open the file to read the
-          data. A good value for FileTemplate is thus "%s%s_3.3d", which will concatentate
+          data. A good value for FileTemplate is thus "%s%s_%3.3d", which will concatentate
           the FilePath and FileName, followed by an underscore and then a 3 digit number with
           leading zeros if required. The underscore is optional, and other characters can
           be placed between the FileName and the FileNumber if desired.</td>