diff --git a/README.md b/README.md
index 750ab76..fd50040 100644
--- a/README.md
+++ b/README.md
@@ -126,4 +126,4 @@ Heta specifications versions follow [Semantic Versioning](https://semver.org/) s
 ## License
 The Heta language specifications are licensed under [Creative Commons Attribution-NoDerivatives 4.0 International License](http://creativecommons.org/licenses/by-nd/4.0/).
 
-InSysBio, 2018-2021
+InSysBio, 2018-2023
diff --git a/changelog.md b/changelog.md
index c22e02e..917c5c9 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## 0.4.4
+
+- use `ProcessExpr` of type: A>B
+
 ## 0.4.3
 
 - add `#defineFunction` action as an experimental
diff --git a/syntax.md b/syntax.md
index e628a3b..1a71eef 100644
--- a/syntax.md
+++ b/syntax.md
@@ -432,7 +432,7 @@ __Example__
 ### ProcessExpr
 
 A `ProcessExpr` formatted string represents process stoichiometry.
-The "arrow" syntax (`->`, `<->`, `=>`, `<=>`) divides two parts: influx (left) and outflux (right).
+The "arrow" syntax (`->`, `<->`, `=>`, `<=>`, `>`, `<>`) divides two parts: influx (left) and outflux (right).
 The "plus" symbol divide two or more actors.
 Stoichiometry coefficients are shown by numbers before reference. The asterisk symbol is optional here.
 
@@ -448,3 +448,4 @@ __Example__
 - `A =>`
 - `2A <=> 3*B + C`
 - `2 A <=> 3 * B + C`
+- `2A > 3R + C`