diff --git a/tool/index.txt b/src/index.txt
similarity index 100%
rename from tool/index.txt
rename to src/index.txt
diff --git a/tool/number.go b/tool/number.go
index 33cfe59..8195b48 100644
--- a/tool/number.go
+++ b/tool/number.go
@@ -29,13 +29,15 @@ func main() {
     }
     baseTrimmer, _ := regexp.Compile("^[0-9x]+-")
     for _, fi := range fileInfos {
-        baseName := baseTrimmer.ReplaceAllString(fi.Name(), "")
-        sourceNames = append(sourceNames, baseName)
-        sourceMap[baseName] = fi.Name()
+		if fi.Name() != "index.txt" {
+        	baseName := baseTrimmer.ReplaceAllString(fi.Name(), "")
+        	sourceNames = append(sourceNames, baseName)
+        	sourceMap[baseName] = fi.Name()
+        }
     }
 
     // read names from index
-    indexBytes, idxErr := ioutil.ReadFile("tool/index.txt")
+    indexBytes, idxErr := ioutil.ReadFile("src/index.txt")
     if idxErr != nil {
         panic(idxErr)
     }