diff --git a/README.md b/README.md
index 2273ce9..8e22e56 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,15 @@ CREATE TABLE chahoutan_post_anchors
     CONSTRAINT fk66omt1yfcmam8rn9s3f5qh6pq FOREIGN KEY (revision_id) REFERENCES chahoutan_revisions (id)
 );
 
+CREATE TABLE chahoutan_post_footnotes
+(
+    revision_id uuid NOT NULL,
+    footnote text NOT NULL,
+    footnote_ordinal int4 NOT NULL,
+    CONSTRAINT chahoutan_post_footnotes_pkey PRIMARY KEY (revision_id, footnote_ordinal),
+    CONSTRAINT fk7epb56mbnx4mqd2vvu5k7fv46 FOREIGN KEY (revision_id) REFERENCES chahoutan_revisions (id)
+);
+
 CREATE TABLE chahoutan_post_images
 (
     revision_id uuid NOT NULL,
diff --git a/src/main/java/org/teacon/chahoutan/entity/Revision.java b/src/main/java/org/teacon/chahoutan/entity/Revision.java
index 28f80b9..c633209 100644
--- a/src/main/java/org/teacon/chahoutan/entity/Revision.java
+++ b/src/main/java/org/teacon/chahoutan/entity/Revision.java
@@ -47,6 +47,12 @@ public class Revision
     @OrderBy("uploadDate ASC")
     private List<Correction> corrections = new ArrayList<>();
 
+    @ElementCollection
+    @OrderColumn(name = "footnote_ordinal", columnDefinition = "int")
+    @Column(name = "footnote", columnDefinition = "text", nullable = false)
+    @CollectionTable(name = "chahoutan_post_footnotes", joinColumns = @JoinColumn(name = "revision_id"))
+    private List<String> footnotes = new ArrayList<>();
+
     @ElementCollection
     @MapKeyColumn(name = "anchor", columnDefinition = "text")
     @Column(name = "link", columnDefinition = "text", nullable = false)
@@ -106,6 +112,16 @@ public List<Image> getImages()
         return List.copyOf(this.images);
     }
 
+    public Map<String, String> getFootnotes()
+    {
+        var footnoteCount = this.footnotes.size();
+        var map = new LinkedHashMap<String, String>(footnoteCount);
+        for (int i = 0; i < footnoteCount; ++i) {
+            map.put(String.format("[%d]", i + 1), this.footnotes.get(i));
+        }
+        return Map.copyOf(map);
+    }
+
     public String getRssPlainText()
     {
         var editors = this.post.getEditors();
@@ -201,6 +217,14 @@ public void setCreationTime(Instant time)
         this.creationTime = time.atZone(ChahoutanConfig.POST_ZONE_ID);
     }
 
+    public void setFootnotes(Map<String, String> footnotes) {
+        var array = new String[footnotes.size()];
+        for (var i = 0; i < array.length; ++i) {
+            array[i] = Objects.requireNonNull(footnotes.get(String.format("[%d]", i + 1)));
+        }
+        this.footnotes = List.of(array);
+    }
+
     public void setAnchors(List<String> anchors)
     {
         var entries = new HashMap<String, String>();
diff --git a/src/main/java/org/teacon/chahoutan/network/PostRequest.java b/src/main/java/org/teacon/chahoutan/network/PostRequest.java
index bc70ad2..7b6e106 100644
--- a/src/main/java/org/teacon/chahoutan/network/PostRequest.java
+++ b/src/main/java/org/teacon/chahoutan/network/PostRequest.java
@@ -8,6 +8,8 @@
 
 import java.time.Instant;
 import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
@@ -15,6 +17,7 @@ public record PostRequest(@JsonProperty(value = "id", required = true) int id,
                           @JsonProperty(value = "text", required = true) String text,
                           @JsonProperty(value = "editors") List<String> editors,
                           @JsonProperty(value = "anchors") List<String> anchors,
+                          @JsonProperty(value = "footnotes") Map<String, String> footnotes,
                           @JsonProperty(value = "images") List<ImageRequest> images)
 {
     private static <T> Stream<T> nullToEmpty(List<T> input)
@@ -22,6 +25,11 @@ private static <T> Stream<T> nullToEmpty(List<T> input)
         return input == null ? Stream.empty() : input.stream();
     }
 
+    private static <S, T> Stream<Map.Entry<T, S>> nullToEmpty(Map<T, S> input)
+    {
+        return input == null ? Stream.empty() : input.entrySet().stream();
+    }
+
     private static String normalize(String text)
     {
         return String.join("\u00a0", text.split("\\s"));
@@ -40,6 +48,9 @@ public Post toPost(ImageRepository repo)
         revision.setText(normalize(this.text));
         revision.setCreationTime(Instant.now());
         revision.setAnchors(nullToEmpty(this.anchors).map(PostRequest::normalize).toList());
+        revision.setFootnotes(nullToEmpty(this.footnotes)
+                .filter(e -> e.getKey().startsWith("[") && e.getKey().endsWith("]"))
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
         revision.setImages(nullToEmpty(this.images).map(request -> request.toImage(repo)).toList());
 
         return post;
diff --git a/src/main/java/org/teacon/chahoutan/network/PostResponse.java b/src/main/java/org/teacon/chahoutan/network/PostResponse.java
index 07c81d2..0f6178e 100644
--- a/src/main/java/org/teacon/chahoutan/network/PostResponse.java
+++ b/src/main/java/org/teacon/chahoutan/network/PostResponse.java
@@ -9,6 +9,7 @@
 import java.net.URI;
 import java.time.OffsetDateTime;
 import java.util.List;
+import java.util.Map;
 import java.util.UUID;
 
 @JsonInclude(value = JsonInclude.Include.NON_NULL)
@@ -23,6 +24,7 @@ public record PostResponse(@JsonProperty(value = "id") int id,
                            @JsonProperty(value = "anchors") List<String> anchors,
                            @JsonProperty(value = "anchor_urls") List<String> anchorUrls,
                            @JsonProperty(value = "images") List<ImageResponse> postImages,
+                           @JsonProperty(value = "footnotes") Map<String, String> footnotes,
                            @JsonProperty(value = "publish_time") OffsetDateTime publishTime)
 {
     public static PostResponse from(Post post)
@@ -30,6 +32,7 @@ public static PostResponse from(Post post)
         var revision = post.getRevision();
         var revisionName = revision.getTitle();
         var publishTime = post.getPublishTime();
+        var footnotes = revision.getFootnotes();
         var urlPrefix = URI.create(ChahoutanConfig.BACKEND_URL_PREFIX);
         var url = urlPrefix.resolve("v1/posts/" + post.getId());
         var revisionUrl = urlPrefix.resolve("v1/posts/" + revision.getId());
@@ -37,7 +40,7 @@ public static PostResponse from(Post post)
         var editors = post.getEditors().stream().sorted().toList();
         var images = revision.getImages().stream().map(ImageResponse::from).toList();
         return new PostResponse(post.getId(), url, type, revisionName, revision.getText(), revision.getId(),
-                revisionUrl, editors, revision.getAnchors(), revision.getAnchorUrls(), images, publishTime);
+                revisionUrl, editors, revision.getAnchors(), revision.getAnchorUrls(), images, footnotes, publishTime);
     }
 
     public static PostResponse from(Revision revision)
@@ -45,6 +48,7 @@ public static PostResponse from(Revision revision)
         var post = revision.getPost();
         var revisionName = revision.getTitle();
         var publishTime = post.getPublishTime();
+        var footnotes = revision.getFootnotes();
         var isPost = post.getRevision() != null && post.getRevision().getId().equals(revision.getId());
         var urlPrefix = URI.create(ChahoutanConfig.BACKEND_URL_PREFIX);
         var url = isPost ? urlPrefix.resolve("v1/posts/" + post.getId()) : null;
@@ -53,6 +57,6 @@ public static PostResponse from(Revision revision)
         var editors = isPost ? post.getEditors().stream().sorted().toList() : null;
         var images = revision.getImages().stream().map(ImageResponse::from).toList();
         return new PostResponse(post.getId(), url, type, revisionName, revision.getText(), revision.getId(),
-                revisionUrl, editors, revision.getAnchors(), revision.getAnchorUrls(), images, publishTime);
+                revisionUrl, editors, revision.getAnchors(), revision.getAnchorUrls(), images, footnotes, publishTime);
     }
 }