diff --git a/README.md b/README.md
index 5a5aa1c..e9ff72d 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,8 @@ Also compares versions lexicographically.
   "arch": "aarch64",
   "os": "linux",
   "libc": "none",
-  "vendor": "unknown"
+  "vendor": "unknown",
+  "unknownTerms": ["infra"]
 }
 ```
 
diff --git a/host-targets.js b/host-targets.js
index 10943b7..14828f1 100644
--- a/host-targets.js
+++ b/host-targets.js
@@ -130,6 +130,7 @@ HostTargets._MATCHERS = {
 
 /**
  * @param {Object.<"os"|"arch"|"libc", String>} target
+ * @param {Array<String>} terms
  */
 HostTargets.termsToTarget = function (target, terms) {
   let bogoTerms = [];
diff --git a/lexver.js b/lexver.js
index d776db1..d296850 100644
--- a/lexver.js
+++ b/lexver.js
@@ -187,7 +187,7 @@ Lexver.parsePrefix = function (version) {
  * Ex: use '0001.0003' to find previous, stable, default, beta, and next
  * @param {Array<String>} versions - sorted lexical versions
  * @param {String} prefix - the string to match
- * @returns {String}
+ * @returns {Object.<String, String>}
  */
 Lexver.matchSorted = function (versions, prefix) {
   let matches = [];
diff --git a/package-lock.json b/package-lock.json
index 71e7279..d787aec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "build-classifier",
-  "version": "0.9.3",
+  "version": "0.9.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "build-classifier",
-      "version": "0.9.3",
+      "version": "0.9.4",
       "license": "SEE LICENSE IN LICENSE"
     }
   }
diff --git a/package.json b/package.json
index 23d8643..e7f653c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "build-classifier",
-  "version": "0.9.3",
+  "version": "0.9.4",
   "description": "Determine Host Target Triplet (Arch, Libc, OS, Vendor) from a filenames / download URL and uname / User-Agent strings.",
   "main": "index.js",
   "scripts": {
diff --git a/triplet.js b/triplet.js
index 67d10c6..92e359c 100644
--- a/triplet.js
+++ b/triplet.js
@@ -678,14 +678,14 @@ var Triplet = ('object' === typeof module && exports) || {};
       vendor: build.vendor || '',
       libc: build.libc || '',
       //ext: build.ext || '',
+      unknownTerms: [],
     });
 
     for (let term of terms) {
       let knownMatch = Triplet.TERMS_PRIMARY_MAP[term];
       if (!knownMatch) {
-        let msg = `${proj.name}: unrecognized term '${term}' in '${terms}'`;
-        let err = new Error(msg);
-        throw err;
+        target.unknownTerms.push(term);
+        continue;
       }
 
       //console.log('dbg-known:', term, knownMatch);
diff --git a/types.js b/types.js
index 7ef8c22..207fdda 100644
--- a/types.js
+++ b/types.js
@@ -24,5 +24,6 @@ module.exports._types = true;
  * @prop {ArchString} arch
  * @prop {LibcString} libc
  * @prop {VendorString} [vendor]
+ * @prop {Array<String>} [unknownTerms]
  * @prop {Boolean} [android] - for intermediary representation
  */