--- /dev/null
+.onlineHelp EOS mrcRefHighPassFilter "Introduction to mrcRefHighPassFilter"
+.
+.section 1 "Introduction to mrcRefHighPassFilter"
+.
+.\" This is the help page associated with the Help button on
+.\" the toplevel window of mrcRefHighPassFilter
+If you are reading this text,
+you should report it as a bug :-)