html: add anchors for headings

1 files changed, 2 insertions, 2 deletions

diff --git a/build.py b/build.py
index 4386aca..1cc8fa4 100755
--- a/build.py
+++ b/build.py
@@ -110,11 +110,11 @@ with open('target/index.html', 'w') as f:
         f.write(h.read())
 
     # TODO: sort by T-lang and T-lib
-    f.write('<h2>Unstable features</h2>')
+    f.write('<h2 id=unstable>Unstable features</h2>')
     write_features(f, unstable_features)
 
     for version, data in reversed(list(versions.items())):
-        f.write('<h2>{}</h2>'.format(version))
+        f.write('<h2 id={0}>{0}</h2>'.format(version))
         if 'features' in data:
             write_features(f, data['features'])