diff --git a/Readme.md b/Readme.md
index c8d5112..b1b1ce8 100644
--- a/Readme.md
+++ b/Readme.md
@@ -71,7 +71,12 @@ The options are also passed to the underlying transform stream, so you can pass
   objectMode: false,
 
   // if set to true, uses first row as keys -> [ { column1: value1, column2: value2 }, ...]
-  columns: false
+  columns: false,
+  
+  // each csv column name is optionally mapped to this so its value can be transformed
+  columnTransform: function(name) {
+    return name
+  }
 }
 ```
 
diff --git a/csv-streamify.js b/csv-streamify.js
index 32f2633..254853e 100644
--- a/csv-streamify.js
+++ b/csv-streamify.js
@@ -16,6 +16,7 @@ module.exports = function (opts, cb) {
   opts.empty = opts.hasOwnProperty('empty') ? opts.empty : ''
   opts.objectMode = opts.objectMode || false
   opts.hasColumns = opts.columns || false
+  opts.columnTransform = opts.columnTransform || function (l) { return l }
 
   // state
   var state = {
@@ -41,7 +42,7 @@ function createParser (opts, state) {
 
     if (opts.hasColumns) {
       if (state.lineNo === 0) {
-        state._columns = state._line
+        state._columns = state._line.map(opts.columnTransform)
         state.lineNo += 1
         reset()
         return