Add SIP number

Sporarum · web-flow · commit 9bf16130d381 · 2022-09-23T13:57:58.000+02:00
diff --git a/content/polymorphic-eta-expansion.md b/content/polymorphic-eta-expansion.md
@@ -1,6 +1,6 @@
 ---
 layout: sip
-title: SIP-NN Polymorphic Eta Expansion
+title: SIP-49 - Polymorphic Eta-Expansion
 stage: implementation
 permalink: /sips/:title.html
 ---
