diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000000..3bc55993a8
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,21 @@
+[tool.codespell]
+count = ""
+ignore-regex = '\b[A-Z]{3}\b'
+ignore-words-list = "ans,asend,deques,dout,extint,hsi,iput,numer,technic,ure"
+quiet-level = 3
+skip = """
+*/build*,\
+./.git,\
+./drivers/cc3100,\
+./lib,\
+./ports/cc3200/FreeRTOS,\
+./ports/cc3200/bootmgr/sl,\
+./ports/cc3200/hal,\
+./ports/cc3200/simplelink,\
+./ports/cc3200/telnet,\
+./ports/nrf/drivers/bluetooth/s1*,\
+./ports/renesas-ra,\
+./ports/stm32/usbhost,\
+./tests,\
+ACKNOWLEDGEMENTS,\
+"""
diff --git a/tools/ci.sh b/tools/ci.sh
index d44f341cef..0eb94b3399 100755
--- a/tools/ci.sh
+++ b/tools/ci.sh
@@ -28,6 +28,17 @@ function ci_code_formatting_run {
     tools/codeformat.py -v
 }
 
+########################################################################################
+# code spelling
+
+function ci_code_spell_setup {
+    pip3 install codespell tomli
+}
+
+function ci_code_spell_run {
+    codespell
+}
+
 ########################################################################################
 # commit formatting