diff --git a/apkg_builder.py b/apkg_builder.py
index bdc1aa6..8581018 100644
--- a/apkg_builder.py
+++ b/apkg_builder.py
@@ -516,6 +516,9 @@ def build_vocab_deck(
 
         note = genanki.Note(
             model=VOCAB_MODEL,
+            # Stable GUID: identity = Hebrew word only, so audio/images/examples
+            # can be added on reimport without breaking note matching.
+            guid=genanki.guid_for(word),
             fields=[
                 word,
                 root,
@@ -576,6 +579,10 @@ def build_conj_deck(
                 return
             note = genanki.Note(
                 model=CONJ_MODEL,
+                # Stable GUID: identity = (infinitive, pronoun, tense) so that
+                # audio and other content fields can be updated on reimport
+                # without Anki treating the note as a new/different note.
+                guid=genanki.guid_for(infinitive, pronoun, tense),
                 fields=[
                     infinitive,
                     ref_form,