diff --git a/.gitattributes b/.gitattributes
index b2efbcfc8380345a65f0498c6a8021d611ed17e2..bf5faa30076359bdc10abff4756035c719b9b01d 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -4,3 +4,6 @@
 *.png binary
 *.jpg binary
 *.gif binary
+# Denote office documents as binary
+*.docx binary
+*.xlsx binary
diff --git a/plugins/ets/doc/lang-exported/Introduction to STS language design.docx b/plugins/ets/doc/lang-exported/Introduction to STS language design.docx
new file mode 100644
index 0000000000000000000000000000000000000000..fd2f010682395d4d07eb162623413b124c67c97d
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diff --git a/plugins/ets/doc/lang-exported/STS Features origin.xlsx b/plugins/ets/doc/lang-exported/STS Features origin.xlsx
new file mode 100644
index 0000000000000000000000000000000000000000..d49c066956c9fb817199a17445376295563cdbd2
Binary files /dev/null and b/plugins/ets/doc/lang-exported/STS Features origin.xlsx differ
diff --git a/plugins/ets/doc/lang-exported/STS Language Formal Spec.docx b/plugins/ets/doc/lang-exported/STS Language Formal Spec.docx
new file mode 100644
index 0000000000000000000000000000000000000000..3cb94de8e9fde4c53de7e09f3919e6a8c9815f7b
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diff --git a/plugins/ets/doc/lang-exported/STS Language Spec.docx b/plugins/ets/doc/lang-exported/STS Language Spec.docx
new file mode 100644
index 0000000000000000000000000000000000000000..84cb4ccd266282b60f11dab31d0e93f58be1d958
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diff --git a/plugins/ets/doc/lang-exported/STS for TS Developers.docx b/plugins/ets/doc/lang-exported/STS for TS Developers.docx
new file mode 100644
index 0000000000000000000000000000000000000000..0b92b239a770a362df06d4f2ef43871b8abea255
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diff --git a/plugins/ets/doc/lang-exported/STS spec - Kotlin.xlsx b/plugins/ets/doc/lang-exported/STS spec - Kotlin.xlsx
new file mode 100644
index 0000000000000000000000000000000000000000..92b377e188a7b305a568a01d72f9e2d616d3c923
Binary files /dev/null and b/plugins/ets/doc/lang-exported/STS spec - Kotlin.xlsx differ
diff --git a/plugins/ets/doc/lang-exported/STS spec.xlsx b/plugins/ets/doc/lang-exported/STS spec.xlsx
new file mode 100644
index 0000000000000000000000000000000000000000..86cb335895ce3d4df10933c688d992a36b6344c4
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diff --git a/plugins/ets/doc/lang-exported/TS to STS Code Samples.docx b/plugins/ets/doc/lang-exported/TS to STS Code Samples.docx
new file mode 100644
index 0000000000000000000000000000000000000000..7cc583800a7e336ede06ed7ed1bf399a742a3e6e
Binary files /dev/null and b/plugins/ets/doc/lang-exported/TS to STS Code Samples.docx differ