diff --git a/data/config.json b/data/config.json
index ed6b4f9a70e8fc61fcc6b1e7569c990318b88b47..87cb6c2e3c64236dbe1c2066fa677144037f4afa 100644
--- a/data/config.json
+++ b/data/config.json
@@ -1,5 +1,5 @@
 {
-  "tree_name": "C",
+  "tree_name": "c",
   "keywords": [],
   "node_id": "c-569d5e11c4fc5de7844053d9a733c5e8",
   "title": "C",
diff --git a/data/tree.json b/data/tree.json
index 2317b4f81206d7abbaa5440ae2ef735f25735876..f2f03601f194a20ec1d7db2d9c7bd939d96dc184 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -1,5 +1,5 @@
 {
-  "C": {
+  "c": {
     "node_id": "c-569d5e11c4fc5de7844053d9a733c5e8",
     "keywords": [],
     "children": [