diff --git a/src/identity.ts b/src/identity.ts
index 55234a1..112a12d 100644
--- a/src/identity.ts
+++ b/src/identity.ts
@@ -320,7 +320,7 @@ export class Contacts {
     const hash = parseNodeHash(channelHash) as number;
     const groups = this.groups[hash] || [];
     if (groups.length === 0) {
-      throw new Error("Unknown group hash");
+      throw new Error(`Unknown group hash ${hash.toString(16).padStart(2, "0")}`);
     }
     for (const group of groups) {
       try {
@@ -330,7 +330,7 @@ export class Contacts {
         // Ignore decryption errors and try the next group.
       }
     }
-    throw new Error("Decryption failed with all known groups");
+    throw new Error(`Decryption failed with all known groups with hash ${hash.toString(16).padStart(2, "0")}`);
   }
 
   public decryptGroupData(
@@ -344,7 +344,7 @@ export class Contacts {
     const hash = parseNodeHash(channelHash) as number;
     const groups = this.groups[hash] || [];
     if (groups.length === 0) {
-      throw new Error("Unknown group hash");
+      throw new Error(`Unknown group hash ${hash.toString(16).padStart(2, "0")}`);
     }
     for (const group of groups) {
       try {
@@ -354,6 +354,6 @@ export class Contacts {
         // Ignore decryption errors and try the next group.
       }
     }
-    throw new Error("Decryption failed with all known groups");
+    throw new Error(`Decryption failed with all known groups with hash ${hash.toString(16).padStart(2, "0")}`);
   }
 }