diff --git a/code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/plugin/AbstractDocumentProcessorPlugin.java b/code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/plugin/AbstractDocumentProcessorPlugin.java
index 913ba81d..9dbd4290 100644
--- a/code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/plugin/AbstractDocumentProcessorPlugin.java
+++ b/code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/plugin/AbstractDocumentProcessorPlugin.java
@@ -52,6 +52,10 @@ public abstract class AbstractDocumentProcessorPlugin {
             add("site", url.domain.domain);
             add("tld", url.domain.getTld());
 
+            if (url.path.startsWith("/~")) {
+                add("special", "tilde");
+            }
+
             return this;
         }