diff --git a/.github/actions/spelling/excludes.txt b/.github/actions/spelling/excludes.txt
new file mode 100644
index 00000000..0bd6cbf6
--- /dev/null
+++ b/.github/actions/spelling/excludes.txt
@@ -0,0 +1,3 @@
+^\.github/actions/spelling/
+^\.travis\.yml$
+\.def$
diff --git a/.github/actions/spelling/expect.txt b/.github/actions/spelling/expect.txt
new file mode 100644
index 00000000..1e714eb3
--- /dev/null
+++ b/.github/actions/spelling/expect.txt
@@ -0,0 +1,1751 @@
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+syscall
+sysconf
+sysctl
+sysctlbyname
+sysname
+syspagesize
+systemtime
+sysv
+sz
+tablename
+tagfile
+tagname
+tarantool
+tarball
+tasklist
+tassert
+tbl
+tcl
+TEAMCITY
+Tebibyte
+tempdir
+testcase
+testdb
+TESTLIST
+TESTLOG
+thr
+THREADENTRY
+THUMBEB
+THUMBEL
+THW
+timebase
+timedwait
+TIMEOFDAY
+TIMERR
+timeslice
+timespec
+timeval
+timperi
+tl
+tlhelp
+Tme
+tmp
+tmpdir
+tmpfs
+toc
+todo
+TODOLIST
+toh
+toolchain
+toolhelp
+toolset
+tooltip
+TOUPPER
+transcoding
+treeview
+tribudubois
+Tru
+TRYFIXED
+trylock
+trywait
+tsan
+tsd
+tsize
+ttf
+ttl
+tw
+twistylittlepassagesallalike
+txkey
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+TXNFULL
+txnid
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+typedef
+typedef'ed
+typename
+ubsan
+ubuntu
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+uint
+uintptr
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+unicode
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+uniq
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+url
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+utmpx
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+wikipedia
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+writefaultn
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+xhtml
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+xp
+XSI
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+yml
+Yota
+Yotta
+Yq
+yuriev
+Zano
+zarch
+Zc
+zd
+zeilenga
+zerofill
+ZEROINIT
+zi
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diff --git a/.github/actions/spelling/patterns.txt b/.github/actions/spelling/patterns.txt
new file mode 100644
index 00000000..90295b77
--- /dev/null
+++ b/.github/actions/spelling/patterns.txt
@@ -0,0 +1,6 @@
+# numbers
+(?:[\\0][xX]|[uU]\+|#)[0-9a-fA-FgGrR]{2,}[uU]?[lL]{0,2}\b
+# avoid false positive
+ -force$
+# flags
+(?!\w)-[fDW]
diff --git a/.github/workflows/spelling.yml b/.github/workflows/spelling.yml
new file mode 100644
index 00000000..db74f454
--- /dev/null
+++ b/.github/workflows/spelling.yml
@@ -0,0 +1,13 @@
+name: Spell checking
+on:
+  push:
+
+jobs:
+  build:
+    name: Spell checking
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.0.0
+      with:
+        fetch-depth: 5
+    - uses: check-spelling/check-spelling@prerelease