diff --git a/check.sh b/check.sh
index 8912f709e7..a0efa531b6 100755
--- a/check.sh
+++ b/check.sh
@@ -41,6 +41,8 @@ if git status --porcelain | grep -q "requirements.txt"; then
     EXIT_STATUS=1
 fi
 
+codespell || EXIT_STATUS=$?
+
 python trio/_tests/check_type_completeness.py --overwrite-file || EXIT_STATUS=$?
 if git status --porcelain trio/_tests/verify_types.json | grep -q "M"; then
     echo "Type completeness changed, please update!"
diff --git a/pyproject.toml b/pyproject.toml
index 3b14a075da..264345d8c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,9 @@
 [tool.black]
 target-version = ['py38']
 
+[tool.codespell]
+ignore-words-list = 'astroid,crasher,asend'
+
 [tool.flake8]
 extend-ignore = ['D', 'E', 'W', 'F403', 'F405', 'F821', 'F822']
 per-file-ignores = [
diff --git a/test-requirements.in b/test-requirements.in
index 23f128f99a..1911b1bf11 100644
--- a/test-requirements.in
+++ b/test-requirements.in
@@ -18,6 +18,7 @@ flake8
 flake8-pyproject
 astor          # code generation
 pip-tools >= 6.13.0
+codespell
 
 # https://github.com/python-trio/trio/pull/654#issuecomment-420518745
 mypy-extensions; implementation_name == "cpython"
diff --git a/test-requirements.txt b/test-requirements.txt
index 939bf7a61e..7e0d86e62e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -28,6 +28,8 @@ click==8.1.5
     # via
     #   black
     #   pip-tools
+codespell==2.2.5
+    # via -r test-requirements.in
 coverage==7.2.7
     # via -r test-requirements.in
 cryptography==41.0.2
diff --git a/trio/_tests/test_exports.py b/trio/_tests/test_exports.py
index 20635b0022..b5d0a44088 100644
--- a/trio/_tests/test_exports.py
+++ b/trio/_tests/test_exports.py
@@ -175,7 +175,7 @@ def no_underscores(symbols):
         if modname == "trio":
             static_names.add("testing")
 
-        # these are hidden behind `if sys.plaftorm != "win32" or not TYPE_CHECKING`
+        # these are hidden behind `if sys.platform != "win32" or not TYPE_CHECKING`
         # so presumably pyright is parsing that if statement, in which case we don't
         # care about them being missing.
         if modname == "trio.socket" and sys.platform == "win32":