diff --git a/package-lock.json b/package-lock.json
index c95b2102..d00105ae 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
-        "@hyperionbt/helios": "^0.15.4",
+        "@hyperionbt/helios": "^0.15.7",
         "@jsdoc/ast": "^0.2.1",
         "@jsdoc/parse": "^0.3.1",
         "typedoc": "^0.24.8",
@@ -60,9 +60,9 @@
       }
     },
     "node_modules/@hyperionbt/helios": {
-      "version": "0.15.4",
-      "resolved": "https://registry.npmjs.org/@hyperionbt/helios/-/helios-0.15.4.tgz",
-      "integrity": "sha512-pVXlFbjDi5vRf47u/+d1Ok1EmWNZJBCsMp4c6BBQpE6pUoZ/NWNC3ugF0EXUK8W3bjY6c1H+cmRvVIcloQrWZA=="
+      "version": "0.15.7",
+      "resolved": "https://registry.npmjs.org/@hyperionbt/helios/-/helios-0.15.7.tgz",
+      "integrity": "sha512-N9I5llxxn627zyFaj5Lap105GCxfE1uCWF8qqafhFu171Ens3KkVUHa23CGTatCkBzA7O6GMR1J2F+IPOO12oA=="
     },
     "node_modules/@jsdoc/ast": {
       "version": "0.2.1",
diff --git a/package.json b/package.json
index 0fb596e0..4abe5f6e 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@hyperionbt/helios": "^0.15.4",
+    "@hyperionbt/helios": "^0.15.7",
     "@jsdoc/ast": "^0.2.1",
     "@jsdoc/parse": "^0.3.1",
     "typedoc": "^0.24.8",
diff --git a/src/lang/structs.md b/src/lang/structs.md
index 9b6332d1..652a602d 100644
--- a/src/lang/structs.md
+++ b/src/lang/structs.md
@@ -24,4 +24,30 @@ The fields can also be named:
 
 ```helios
 const x = Rational { bottom: 3, top: 1 }
-```
\ No newline at end of file
+```
+
+## CIP 68 tags
+
+Regular Helios structs are internally implemented as data-lists. 
+
+This internal data-list format isn't convenient for datums that are intended for public reading/writing. For such applications it is recommended to use the [CIP 68](https://cips.cardano.org/cips/cip68/) data-map format.
+
+Helios will automatically use the [CIP 68](https://cips.cardano.org/cips/cip68/) format internally if any `struct` field is tagged. The tags are internally converted into the data-map keys.
+
+```helios
+struct TaggedRational {
+    top:    Int "@top"     // the tag can be any valid utf-8 string
+    bottom: Int "@bottom"
+}
+```
+
+Any missing tags default to the field name:
+
+```helios
+struct TaggedRational {
+    top:    Int "@top"
+    bottom: Int         // data-map key will be "bottom"
+}
+```
+
+Field tagging isn't available for enum variants.
\ No newline at end of file