diff --git a/doc/1.intro.md b/doc/1.intro.md
index 6ec45c0..053c852 100644
--- a/doc/1.intro.md
+++ b/doc/1.intro.md
@@ -106,9 +106,9 @@ references:
     issued: 2003-3-5, 2003-4-5
 
 # Font
-mainfont: Libertinus Serif
-mathfont: Libertinus Math
-monofont: Fira Mono
+# mainfont: Libertinus Serif
+# mathfont: Libertinus Math
+# monofont: Fira Mono
 
 # PDF output options
 classoptions:
diff --git a/doc/gray.1 b/doc/gray.1
index b02a970..c93b131 100644
--- a/doc/gray.1
+++ b/doc/gray.1
@@ -1,4 +1,4 @@
-[INPUT FILES]
+.SH [INPUT FILES]
 All files used by \fBgray\fR are only named by convention since their filenames
 must be manually specified, except the parameters file.
 The latter defaults to \fCgray_params.data\fR and is configured using the
@@ -29,12 +29,12 @@ Plasma kinetic profiles file
 This file contains the radial profiles of the plasma temperature, density and
 effective charge.
 
-[OUTPUT FILES]
+.SH [OUTPUT FILES]
 GRAY output files are named according to the Fortran unit number (e.g
 \fCfort.4\fR) and written to the current directory, by default. The
 location can be changed with the \fB-o\fR option.
 
 For a list of the unit numbers and their descriptions see the GRAY user manual.
 
-[SEE ALSO]
+.SH [SEE ALSO]
 \fBgray_params.data\fR(5), \fBbeamdata.txt\fR(5), \fBprofiles.txt\fR(5)