diff --git a/ses/pulse_dev.md b/ses/pulse_dev.md
index b89aa5c..ba49a7e 100644
--- a/ses/pulse_dev.md
+++ b/ses/pulse_dev.md
@@ -2,6 +2,7 @@
 title: pulse under latent semantic envelopes - development notes
 album: Shirakaba Express Service
 categories:
+  - Songwriting notes
 wiki:
   publish: true
 ---