diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4989340..8a4cf42 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## Unreleased
+
+### New in `sym`
+
+- Relations
+  - `prec.curly`: ⊰
+  - `succ.curly`: ⊱
+
 ## Version 0.2.0 (October 7, 2025)
 
 ### General changes
diff --git a/src/modules/sym.txt b/src/modules/sym.txt
index b84f62a..943af45 100644
--- a/src/modules/sym.txt
+++ b/src/modules/sym.txt
@@ -423,6 +423,7 @@ approx ≈
   .not ≉
 prec ≺
   .approx ⪷
+  .curly ⊰
   .curly.eq ≼
   .curly.eq.not ⋠
   .double ⪻
@@ -436,6 +437,7 @@ prec ≺
   .tilde ≾
 succ ≻
   .approx ⪸
+  .curly ⊱
   .curly.eq ≽
   .curly.eq.not ⋡
   .double ⪼