diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a2d29e..363368c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@
   improve compatibility with other RDF/JS tooling but may cause compatibility
   issues with existing code. The previous behavior is historical and may
   predate the RDF/JS spec.
+- **BREAKING**: Change maximum deep iterations error text.
 - Update tooling.
 - Update for latest [rdf-canon][] changes: test suite location, README, links,
   and identifiers.
diff --git a/lib/URDNA2015.js b/lib/URDNA2015.js
index 14243df..a4f2ef1 100644
--- a/lib/URDNA2015.js
+++ b/lib/URDNA2015.js
@@ -274,7 +274,7 @@ module.exports = class URDNA2015 {
   async hashNDegreeQuads(id, issuer) {
     if(this.remainingDeepIterations === 0) {
       throw new Error(
-        `Maximum deep iterations (${this.maxDeepIterations}) exceeded.`);
+        `Maximum deep iterations exceeded (${this.maxDeepIterations}).`);
     }
     this.remainingDeepIterations--;
 
diff --git a/lib/URDNA2015Sync.js b/lib/URDNA2015Sync.js
index 276daa1..295c547 100644
--- a/lib/URDNA2015Sync.js
+++ b/lib/URDNA2015Sync.js
@@ -273,7 +273,7 @@ module.exports = class URDNA2015Sync {
   hashNDegreeQuads(id, issuer) {
     if(this.remainingDeepIterations === 0) {
       throw new Error(
-        `Maximum deep iterations (${this.maxDeepIterations}) exceeded.`);
+        `Maximum deep iterations exceeded (${this.maxDeepIterations}).`);
     }
     this.remainingDeepIterations--;