diff --git a/doc/lammps.1 b/doc/lammps.1
index c868a2a86f..0e2831f5ca 100644
--- a/doc/lammps.1
+++ b/doc/lammps.1
@@ -1,4 +1,4 @@
-.TH LAMMPS "29 September 2021" "2021-09-29"
+.TH LAMMPS "1" "29 September 2021" "2021-09-29"
 .SH NAME
 .B LAMMPS
 \- Molecular Dynamics Simulator.
diff --git a/doc/msi2lmp.1 b/doc/msi2lmp.1
index 91916fb3a5..ba771da7dc 100644
--- a/doc/msi2lmp.1
+++ b/doc/msi2lmp.1
@@ -1,4 +1,4 @@
-.TH MSI2LMP "v3.9.9" "2018-11-05"
+.TH MSI2LMP "1" "v3.9.9" "2018-11-05"
 .SH NAME
 .B MSI2LMP
 \- Converter for Materials Studio files to LAMMPS