diff --git a/docs/flows.md b/docs/flows.md
index cdb3ab958..547cc597f 100644
--- a/docs/flows.md
+++ b/docs/flows.md
@@ -27,7 +27,6 @@ An EPP flow that creates a new contact.
     *   Internationalized postal infos can only contain ASCII characters.
 *   2302
     *   Resource with this id already exists.
-    *   Resource with this id already exists.
 *   2306
     *   Declining contact disclosure is disallowed by server policy.
 
@@ -342,7 +341,6 @@ An EPP flow that creates a new domain resource.
     *   Registrar must be active in order to perform this operation.
 *   2302
     *   Resource with this id already exists.
-    *   Resource with this id already exists.
 *   2303
     *   Resource linked to this domain does not exist.
 *   2304
@@ -825,7 +823,6 @@ allows creating a host name, and if necessary enqueues tasks to update DNS.
     *   Host names must be puny-coded.
 *   2302
     *   Resource with this id already exists.
-    *   Resource with this id already exists.
 *   2303
     *   Superordinate domain for this hostname does not exist.
 *   2304
diff --git a/java/google/registry/documentation/MarkdownDocumentationFormatter.java b/java/google/registry/documentation/MarkdownDocumentationFormatter.java
index fd6136755..a080e36de 100644
--- a/java/google/registry/documentation/MarkdownDocumentationFormatter.java
+++ b/java/google/registry/documentation/MarkdownDocumentationFormatter.java
@@ -163,15 +163,18 @@ public final class MarkdownDocumentationFormatter {
       for (Long code : flowDoc.getErrorsByCode().keySet()) {
         output.append(String.format("*   %d\n", code));
 
+        flowDoc.getErrorsByCode().get(code).stream()
+            .map(ErrorCase::getReason)
+            .distinct()
+            .forEach(
+                reason -> {
+                  output.append("    *   ");
+                  String wrappedReason = reflow(fixHtml(reason), LINE_WIDTH - 8);
 
-        for (ErrorCase error : flowDoc.getErrorsByCode().get(code)) {
-          output.append("    *   ");
-          String wrappedReason = reflow(fixHtml(error.getReason()), LINE_WIDTH - 8);
-
-          // Replace internal newlines with indentation and strip the final newline.
-          output.append(wrappedReason.trim().replace("\n", "\n" + INDENT8));
-          output.append('\n');
-        }
+                  // Replace internal newlines with indentation and strip the final newline.
+                  output.append(wrappedReason.trim().replace("\n", "\n" + INDENT8));
+                  output.append('\n');
+                });
       }
       output.append('\n');
     }