diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 5ff05c8e7e..22b8f2e03e 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3260,7 +3260,7 @@
         <glossentry id='var-IMAGE_BOOT_FILES'><glossterm>IMAGE_BOOT_FILES</glossterm>
             <glossdef>
                 <para>
-                    A comma-separated list of files installed into the
+                    A space-separated list of files installed into the
                     boot partition when preparing an image.
                     By default, the files are installed under the same name as
                     the source files.