diff --git a/rowers/templates/document_form.html b/rowers/templates/document_form.html
index 997bfc37..3c02acee 100644
--- a/rowers/templates/document_form.html
+++ b/rowers/templates/document_form.html
@@ -15,12 +15,28 @@
       $(document).ready(function() {
       $('#id_file').on('change', function(evt) {
       var f = this.files[0];
+      var istcx = false;
+      var isgzip = false;
+      var size1 = 10485760;
+      var size2 = 1048576;
+      if ((/\.(tcx|TCX)/i).test(f.name)) {
+        istcx = true;
+        console.log('tcx');
+        if ((/\.(gz|GZ)/i).test(f.name)) {
+          isgzip = true;
+          console.log('gzip');
+          size1 /= 5;
+      size2 /= 5;
+      }
+      }
       console.log(f);
-      if (f.size > 4194304) {
-        alert("File Size must be smaller than 4 MB");
+      console.log(size1)
+      console.log(size2)
+      if (f.size > size1) {
+        alert("File Size must be smaller than 10 MB");
         this.value = null;
       }
-      if (f.size > 1048576) {
+      if (f.size > size2) {
       $('#id_offline').val('True');
       $('#id_offline').prop('checked','True');
       console.log("Set offline to True");