diff --git a/doc/nano.texi b/doc/nano.texi
index 9a1a1320..fab503b0 100644
--- a/doc/nano.texi
+++ b/doc/nano.texi
@@ -1164,8 +1164,10 @@ or the word "Space".
 Example: @code{M-C}.
 
 @item
-@code{F@var{n}} ------ where @var{n} is a numeric value from 1 to 16.
+@code{F@var{n}} ------ where @var{n} is a numeric value from 1 to 24.
 Example: @code{F10}.
+(Often, @code{F13} to @code{F24} can be typed as @code{F1} to @code{F12}
+with Shift.)
 
 @item
 @code{Ins} or @code{Del}.
diff --git a/doc/nanorc.5 b/doc/nanorc.5
index 41584d0e..87d85713 100644
--- a/doc/nanorc.5
+++ b/doc/nanorc.5
@@ -495,8 +495,10 @@ where \fIX\fR is any ASCII character except [, or the word "Space".
 Example: M\-C.
 .TP
 .BI F N
-where \fIN\fR is a numeric value from 1 to 16.
+where \fIN\fR is a numeric value from 1 to 24.
 Example: F10.
+(Often, \fBF13\fR to \fBF24\fR can be typed as \fBF1\fR to \fBF12\fR with Shift.)
+
 .TP
 .BR Ins " or " Del .
 .RE
diff --git a/src/global.c b/src/global.c
index 000c894c..c8b01c7e 100644
--- a/src/global.c
+++ b/src/global.c
@@ -503,7 +503,7 @@ int keycode_from_string(const char *keystring)
 			return -1;
 	} else if (keystring[0] == 'F') {
 		int fn = atoi(&keystring[1]);
-		if (fn < 1 || fn > 16)
+		if (fn < 1 || fn > 24)
 			return -1;
 		return KEY_F0 + fn;
 	} else if (!strcasecmp(keystring, "Ins"))
diff --git a/syntax/nanorc.nanorc b/syntax/nanorc.nanorc
index 82dcbc64..71820351 100644
--- a/syntax/nanorc.nanorc
+++ b/syntax/nanorc.nanorc
@@ -11,8 +11,8 @@ icolor brightgreen "^[[:space:]]*(set|unset)[[:space:]]+(afterends|allow_insecur
 icolor yellow "^[[:space:]]*set[[:space:]]+((error|function|key|number|selected|status|stripe|title)color)[[:space:]]+(bright)?(white|black|red|blue|green|yellow|magenta|cyan|normal)?(,(white|black|red|blue|green|yellow|magenta|cyan|normal))?\>"
 icolor brightgreen "^[[:space:]]*set[[:space:]]+(backupdir|brackets|errorcolor|functioncolor|keycolor|matchbrackets|numbercolor|operatingdir|punct|quotestr|selectedcolor|speller|statuscolor|stripecolor|titlecolor|whitespace|wordchars)[[:space:]]+"
 icolor brightgreen "^[[:space:]]*set[[:space:]]+(fill[[:space:]]+-?[[:digit:]]+|(guidestripe|tabsize)[[:space:]]+[1-9][0-9]*)\>"
-icolor brightgreen "^[[:space:]]*bind[[:space:]]+((\^([[:alpha:]]|[]@\^_]|Space)|M-([[:alpha:]]|[]!"#$%&'()*+,./0-9:;<=>?@\^_`{|}~-]|Space))|F([1-9]|1[0-6])|Ins|Del)[[:space:]]+([[:alpha:]]+|".*")[[:space:]]+(all|main|search|replace(with)?|yesno|gotoline|writeout|insert|ext(ernal)?cmd|help|spell|linter|browser|whereisfile|gotodir)([[:space:]]+#|[[:space:]]*$)"
-icolor brightgreen "^[[:space:]]*unbind[[:space:]]+((\^([[:alpha:]]|[]@\^_]|Space)|M-([[:alpha:]]|[]!"#$%&'()*+,./0-9:;<=>?@\^_`{|}~-]|Space))|F([1-9]|1[0-6])|Ins|Del)[[:space:]]+(all|main|search|replace(with)?|yesno|gotoline|writeout|insert|ext(ernal)?cmd|help|spell|linter|browser|whereisfile|gotodir)([[:space:]]+#|[[:space:]]*$)"
+icolor brightgreen "^[[:space:]]*bind[[:space:]]+((\^([[:alpha:]]|[]@\^_]|Space)|M-([[:alpha:]]|[]!"#$%&'()*+,./0-9:;<=>?@\^_`{|}~-]|Space))|F([1-9]|1[0-9]|2[0-4])|Ins|Del)[[:space:]]+([[:alpha:]]+|".*")[[:space:]]+(all|main|search|replace(with)?|yesno|gotoline|writeout|insert|ext(ernal)?cmd|help|spell|linter|browser|whereisfile|gotodir)([[:space:]]+#|[[:space:]]*$)"
+icolor brightgreen "^[[:space:]]*unbind[[:space:]]+((\^([[:alpha:]]|[]@\^_]|Space)|M-([[:alpha:]]|[]!"#$%&'()*+,./0-9:;<=>?@\^_`{|}~-]|Space))|F([1-9]|1[0-9]|2[0-4])|Ins|Del)[[:space:]]+(all|main|search|replace(with)?|yesno|gotoline|writeout|insert|ext(ernal)?cmd|help|spell|linter|browser|whereisfile|gotodir)([[:space:]]+#|[[:space:]]*$)"
 icolor brightgreen "^[[:space:]]*extendsyntax[[:space:]]+[[:alpha:]]+[[:space:]]+(i?color|header|magic|comment|linter|tabgives)[[:space:]]+.*"
 icolor brightgreen "^[[:space:]]*(syntax|linter)[[:space:]]+[^[:blank:]]+"
 icolor green "^[[:space:]]*((un)?(bind|set)|include|syntax|header|magic|comment|linter|tabgives|extendsyntax)\>"