diff --git a/doc/src/fix_orient.rst b/doc/src/fix_orient.rst
index 8fdcc79ace..ca5ba83108 100644
--- a/doc/src/fix_orient.rst
+++ b/doc/src/fix_orient.rst
@@ -6,6 +6,9 @@ fix orient/fcc command
 fix orient/bcc command
 ======================
 
+Syntax
+""""""
+
 .. parsed-literal::
 
    fix ID group-ID orient/fcc nstats dir alat dE cutlo cuthi file0 file1
diff --git a/doc/src/fix_poems.rst b/doc/src/fix_poems.rst
index 1be7a90419..f9a0e72b3d 100644
--- a/doc/src/fix_poems.rst
+++ b/doc/src/fix_poems.rst
@@ -3,7 +3,8 @@
 fix poems command
 =================
 
-Syntax:
+Syntax
+""""""
 
 .. parsed-literal::
 
diff --git a/doc/src/fix_rhok.rst b/doc/src/fix_rhok.rst
index 089c96dd50..be4780c7d8 100644
--- a/doc/src/fix_rhok.rst
+++ b/doc/src/fix_rhok.rst
@@ -3,6 +3,9 @@
 fix rhok command
 ================
 
+Syntax
+""""""
+
 .. parsed-literal::
 
    fix ID group-ID rhok nx ny nz K a