diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bd73b6..361ff84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
-### 0.1.0 (2024-06-29)
+### 1.0.0 (2024-06-29)
 1. add `tk.TextWindow`
-2. 
+2. add `utils.unix_rlimit`
+3. release as the first stable version
 
 ### 0.0.9 (2024-06-26)
 1. add `tk.TKit.ask_text`
diff --git a/README.md b/README.md
index 0cd7990..12b2b13 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,8 @@ print(morebuiltins.__file__)
 
 1.25 `switch_flush_print` - Set builtins.print default flush=True.
 
+1.26 `unix_rlimit` - Unix only. RLIMIT_RSS, RLIMIT_FSIZE to limit the max_memory and max_file_size
+
 
 ## 2. morebuiltins.date
 
diff --git a/doc.md b/doc.md
index faa523f..f184b03 100644
--- a/doc.md
+++ b/doc.md
@@ -618,6 +618,15 @@
 ---
 
 
+
+1.26 `unix_rlimit` - Unix only. RLIMIT_RSS, RLIMIT_FSIZE to limit the max_memory and max_file_size
+
+```python
+```
+
+---
+
+
 ## 2. morebuiltins.date
 
 
diff --git a/morebuiltins/__init__.py b/morebuiltins/__init__.py
index 4b10607..9ae272c 100644
--- a/morebuiltins/__init__.py
+++ b/morebuiltins/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.1.0"
+__version__ = "1.0.0"
 __all__ = [
     "morebuiltins.utils",
     "morebuiltins.date",
diff --git a/morebuiltins/utils.py b/morebuiltins/utils.py
index ae9a750..f952a18 100644
--- a/morebuiltins/utils.py
+++ b/morebuiltins/utils.py
@@ -57,6 +57,7 @@
     "get_paste",
     "set_clip",
     "switch_flush_print",
+    "unix_rlimit",
 ]
 
 
@@ -1111,6 +1112,16 @@ def flush_print(*args, **kwargs):
     builtins.print = flush_print
 
 
+def unix_rlimit(max_mem, max_file_size):
+    "Unix only. RLIMIT_RSS, RLIMIT_FSIZE to limit the max_memory and max_file_size"
+    import resource
+
+    if max_mem:
+        resource.setrlimit(resource.RLIMIT_RSS, (max_mem, max_mem))
+    if max_file_size:
+        resource.setrlimit(resource.RLIMIT_FSIZE, (max_file_size, max_file_size))
+
+
 if __name__ == "__main__":
     __name__ = "morebuiltins.utils"
     import doctest