diff --git a/README.md b/README.md
index 75a4ef8..49e7f87 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,8 @@ HISTORY
   * Add missing values
   * Add notes about CSS preprocessors
   * Fix test
+  * Add version checking
+
 
 ### v0.8
 
diff --git a/after/syntax/css/css3-transitions.vim b/after/syntax/css/css3-transitions.vim
index 0a6185f..966cc97 100644
--- a/after/syntax/css/css3-transitions.vim
+++ b/after/syntax/css/css3-transitions.vim
@@ -1,6 +1,7 @@
-" TODO: create cssTransitionProp group and cssTransitionAttr group
-syn match cssFontProp contained "\<transition\(-\(property\|duration\|timing-function\|delay\)\)\=\>"
-syn keyword cssFontAttr contained linear
-syn match cssFontAttr contained "\<ease\(-\(in\|out\|in-out\)\)\=\>"
-syn match cssFontAttr contained "\<step-\(start\|end\)\>"
-syn region cssFunction contained matchgroup=cssFunctionName start="\<\(steps\|cubic-bezier\)\s*(" end=")" oneline keepend
+if hlexists('cssTransitionProp')
+  syn match cssFontProp contained "\<transition\(-\(property\|duration\|timing-function\|delay\)\)\=\>"
+  syn keyword cssFontAttr contained linear
+  syn match cssFontAttr contained "\<ease\(-\(in\|out\|in-out\)\)\=\>"
+  syn match cssFontAttr contained "\<step-\(start\|end\)\>"
+  syn region cssFunction contained matchgroup=cssFunctionName start="\<\(steps\|cubic-bezier\)\s*(" end=")" oneline keepend
+endif