diff --git a/iwa/111.md b/iwa/111.md
new file mode 100644
index 0000000..f29ff09
--- /dev/null
+++ b/iwa/111.md
@@ -0,0 +1,47 @@
+# Protobuf MD5 Checksums for 11.1
+
+The checksums are based on definitions from version 11.1 (7031.0.102)
+
+```proto
+MD5 (KNArchives.proto) = 0ae33c5ff8c2cb15f543bb8722c74150
+MD5 (KNArchives.sos.proto) = 5b8e5101e946eaddca341b78b5f6e660
+MD5 (KNCommandArchives.proto) = 4c00c5c7af1c137ab00dff331fc66e2b
+MD5 (KNCommandArchives.sos.proto) = af09afc07db32005ff1eaf183fe99c02
+MD5 (TNArchives.proto) = af9dc9952a7088e71485dfa46ab50d46
+MD5 (TNArchives.sos.proto) = 7a8ce65fa23d554fba3549f6ec5d1aa5
+MD5 (TNCommandArchives.proto) = 3c774a94f80fdaee14b238074251ca6f
+MD5 (TNCommandArchives.sos.proto) = 279eafd525689d2e8805e951f9a0b9a6
+MD5 (TPArchives.proto) = bd13bff2a17850f25d2b7057f1a37322
+MD5 (TPCommandArchives.proto) = 1cf18ff056e7635f1cfcb68ec943892b
+MD5 (TPCommandArchives.sos.proto) = 7b627bc1e053a03a762952c5d647a97a
+MD5 (TSAArchives.proto) = b0375fcda6cf124e0f281bec20140797
+MD5 (TSAArchives.sos.proto) = 8b55a583851f1d11a2af842f20223bc7
+MD5 (TSACommandArchives.sos.proto) = d0e4741e2fea6dde83b17a7e73d12af7
+MD5 (TSCEArchives.proto) = f178b693a59c08bb146ff9fd118f33a1
+MD5 (TSCH3DArchives.proto) = 2ac8ee10b2e28c5d201524a388a2eb9e
+MD5 (TSCHArchives.Common.proto) = 0d7160d081f9766046bc0aa53fc776fa
+MD5 (TSCHArchives.GEN.proto) = 75dac94cf24cbb4e1e5d981656dc75c4
+MD5 (TSCHArchives.proto) = b2c18485d0e00388bc221fdab9d8e27d
+MD5 (TSCHArchives.sos.proto) = 73ef81570b7f86356daf53c555922e79
+MD5 (TSCHCommandArchives.proto) = 75cc30b1ba010f1172d0d08eff8bfa9f
+MD5 (TSCHPreUFFArchives.proto) = 5a9c935194bd772a30774071ac7a7f64
+MD5 (TSDArchives.proto) = b2a29857f469e5e1edd8d730fd8f9c99
+MD5 (TSDArchives.sos.proto) = ccbc06fd5b8db95e78b4b404a0d2177f
+MD5 (TSDCommandArchives.proto) = 878c419d11b043333e1ed5148a868626
+MD5 (TSKArchives.proto) = 4cbf17fa875e5962486ab73f31d37c1b
+MD5 (TSKArchives.sos.proto) = 5e68b45687d33b9e2cdc0f64d76988f9
+MD5 (TSPArchiveMessages.proto) = 5bd640aed4df2758a393143096cbaf70
+MD5 (TSPDatabaseMessages.proto) = ab86cd136e1702555b5080f59609f2f1
+MD5 (TSPMessages.proto) = 1a33eb51dfb1f8ccbabdc6e236690ce0
+MD5 (TSSArchives.proto) = 13d7f819625099a68f4d76509252a8e3
+MD5 (TSSArchives.sos.proto) = 951c42b9fd732552ffc4944fe414890a
+MD5 (TSTArchives.proto) = 2f6ea6c83774730a657687f882dc7867
+MD5 (TSTArchives.sos.proto) = aab4c6f0e1031d13e69e4695b36a6fe8
+MD5 (TSTCommandArchives.proto) = 8745ba8f1f93078490c42c8cf5c039d2
+MD5 (TSTStylePropertyArchiving.proto) = 9b64cfdc2fd970c7e2164ee6888a989a
+MD5 (TSWPArchives.proto) = 7d171fbf72e184957773c6ad84ff4f09
+MD5 (TSWPArchives.sos.proto) = 06be0c76ea913408da04153b292f08e0
+MD5 (TSWPCommandArchives.proto) = dabb9f2e85ffdba52aaca61064303c71
+```
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/notes?pixel)](https://github.com/SheetJS/notes)
diff --git a/iwa/README.md b/iwa/README.md
index 933bf03..7ad6955 100644
--- a/iwa/README.md
+++ b/iwa/README.md
@@ -271,6 +271,8 @@ a field that does not appear in Numbers.
 
 ### MD5 Checksums
 
+- [11.1](./111.md)
+
 - [11.2](./112.md)
 
 - [12.0](./120.md)