diff --git a/runtime/syntax/groovy.vim b/runtime/syntax/groovy.vim
index 42fcf4a..dc39677 100644
--- a/runtime/syntax/groovy.vim
+++ b/runtime/syntax/groovy.vim
@@ -2,9 +2,9 @@
 " Language:	Groovy
 " Original Author:	Alessio Pace <billy.corgan@tiscali.it>
 " Maintainer:	Tobias Rapp <yahuxo@gmx.de>
-" Version: 	0.1.14
+" Version: 	0.1.16
 " URL:	  http://www.vim.org/scripts/script.php?script_id=945
-" Last Change:	2015 Apr 21
+" Last Change:	2016 May 23
 
 " THE ORIGINAL AUTHOR'S NOTES:
 "
@@ -255,8 +255,11 @@
 syn region  groovyString          start=+'+ end=+'+ end=+$+ contains=groovySpecialChar,groovySpecialError,@Spell
 syn region  groovyString          start=+"""+ end=+"""+ contains=groovySpecialChar,groovySpecialError,@Spell,groovyELExpr
 syn region  groovyString          start=+'''+ end=+'''+ contains=groovySpecialChar,groovySpecialError,@Spell
-" regex string
-syn region groovyString           start='/[^/]'  end='/' contains=groovySpecialChar,groovyRegexChar,groovyELExpr
+if exists("groovy_regex_strings")
+  " regex strings interfere with the division operator and thus are disabled
+  " by default
+  syn region groovyString         start='/[^/*]' end='/' contains=groovySpecialChar,groovyRegexChar,groovyELExpr
+endif
 " syn region groovyELExpr start=+${+ end=+}+ keepend contained
 syn match groovyELExpr /\${.\{-}}/ contained
 syn match groovyELExpr /\$[a-zA-Z_][a-zA-Z0-9_.]*/ contained
diff --git a/runtime/syntax/scheme.vim b/runtime/syntax/scheme.vim
index a210b0c..c59e09c 100644
--- a/runtime/syntax/scheme.vim
+++ b/runtime/syntax/scheme.vim
@@ -1,6 +1,6 @@
 " Vim syntax file
 " Language:	Scheme (R5RS + some R6RS extras)
-" Last Change:	2012 May 13
+" Last Change:	2016 May 23
 " Maintainer:	Sergey Khorev <sergey.khorev@gmail.com>
 " Original author:	Dirk van Deun <dirk@igwe.vub.ac.be>
 
@@ -245,6 +245,18 @@
     syn region schemeUnquote matchgroup=Delimiter start="#,@\[" end="\]" contains=ALL
     syn region schemeQuoted matchgroup=Delimiter start="#['`]" end=![ \t()\[\]";]!me=e-1 contains=ALL
     syn region schemeQuoted matchgroup=Delimiter start="#['`](" matchgroup=Delimiter end=")" contains=ALL
+
+    " Identifiers are very liberal in MzScheme/Racket
+    syn match schemeOther ![^()[\]{}",'`;#|\\ ]\+!
+
+    " Language setting
+    syn match schemeLang "#lang [-+_/A-Za-z0-9]\+\>"
+
+    " Various number forms
+    syn match schemeNumber "[-+]\=[0-9]\+\(\.[0-9]*\)\=\(e[-+]\=[0-9]\+\)\=\>"
+    syn match schemeNumber "[-+]\=\.[0-9]\+\(e[-+]\=[0-9]\+\)\=\>"
+    syn match schemeNumber "[-+]\=[0-9]\+/[0-9]\+\>"
+    syn match schemeNumber "\([-+]\=\([0-9]\+\(\.[0-9]*\)\=\(e[-+]\=[0-9]\+\)\=\|\.[0-9]\+\(e[-+]\=[0-9]\+\)\=\|[0-9]\+/[0-9]\+\)\)\=[-+]\([0-9]\+\(\.[0-9]*\)\=\(e[-+]\=[0-9]\+\)\=\|\.[0-9]\+\(e[-+]\=[0-9]\+\)\=\|[0-9]\+/[0-9]\+\)\=i\>"
 endif
 
 
@@ -321,6 +333,9 @@
 
   HiLink schemeExtSyntax	Type
   HiLink schemeExtFunc		PreProc
+
+  HiLink schemeLang		PreProc
+
   delcommand HiLink
 endif