diff --git a/doc/nano.texi b/doc/nano.texi
index 93d25bb1..d641e951 100644
--- a/doc/nano.texi
+++ b/doc/nano.texi
@@ -695,6 +695,7 @@ be used to configure @command{nano} on startup without using command-line
 options.  Additionally, there are some commands to define syntax highlighting
 and to rebind keys --- @pxref{Syntax Highlighting} and @ref{Rebinding Keys}.
 @command{nano} will read one command per line.
+All commands and keywords should be written in lowercase.
 
 Options in nanorc files take precedence over @command{nano}'s defaults, and
 command-line options override nanorc settings.  Also, options that do not
diff --git a/doc/nanorc.5 b/doc/nanorc.5
index 062ada4d..b7509ed1 100644
--- a/doc/nanorc.5
+++ b/doc/nanorc.5
@@ -44,6 +44,7 @@ commands, which can be used to configure nano on startup without using
 command-line options.  Additionally, there are some commands to define
 syntax highlighting and to rebind keys -- see the two separate sections
 on those.  \fBnano\fP reads one command per line.
+All commands and keywords should be written in lowercase.
 .sp
 Options in \fInanorc\fP files take precedence over nano's defaults, and
 command-line options override \fInanorc\fP settings.  Also, options that