diff --git a/server/webserver.py b/server/webserver.py
index 9fca296..738b300 100644
--- a/server/webserver.py
+++ b/server/webserver.py
@@ -137,6 +137,9 @@ class WebServer:
         # in seconds UTC.
         # We can also filter by source, sig, band, mode, dx_continent and de_continent. Each of these accepts a single
         # value or a comma-separated list.
+        # We can filter by comments, accepting a single string, where the API will only return spots where the comment
+        # contains the provided value (case-insensitive).
+        # We can "de-dupe" spots, so only the latest spot will be sent for each callsign.
         # We can provide a "limit" number as well. Spots are always returned newest-first; "limit" limits to only the
         # most recent X spots.
         spot_ids = list(self.spots.iterkeys())
@@ -179,6 +182,22 @@ class WebServer:
                 case "de_continent":
                     deconts = query.get(k).split(",")
                     spots = [s for s in spots if s.de_continent and s.de_continent in deconts]
+                case "comment_includes":
+                    comment_includes = query.get(k).strip()
+                    spots = [s for s in spots if s.comment and comment_includes.upper() in s.comment.upper()]
+                case "dedupe":
+                    # Ensure only the latest spot of each callsign is present in the list. This relies on the list being
+                    # in reverse time order, so if any future change allows re-ordering the list, that should be done
+                    # *after* this.
+                    dedupe = query.get(k).upper() == "TRUE"
+                    if dedupe:
+                        spots_temp = []
+                        already_seen = []
+                        for s in spots:
+                            if s.dx_call not in already_seen:
+                                spots_temp.append(s)
+                                already_seen.append(s.dx_call)
+                        spots = spots_temp
         # If we have a "limit" parameter, we apply that last, regardless of where it appeared in the list of keys.
         if "limit" in query.keys():
             spots = spots[:int(query.get("limit"))]
diff --git a/webassets/apidocs/openapi.yml b/webassets/apidocs/openapi.yml
index 7d8d910..49765be 100644
--- a/webassets/apidocs/openapi.yml
+++ b/webassets/apidocs/openapi.yml
@@ -76,6 +76,12 @@ paths:
               - WWBOTA
               - GMA
               - HEMA
+              - WCA
+              - MOTA
+              - SiOTA
+              - ARLHS
+              - ILLW
+              - ZLOTA
         - name: band
           in: query
           description: "Limit the spots to only ones from one or more bands. To select more than one band, supply a comma-separated list."
@@ -168,6 +174,19 @@ paths:
               - AF
               - OC
               - AN
+        - name: dedupe
+          in: query
+          description: "\"De-duplicate\" the spots, returning only the latest spot for any given callsign."
+          required: false
+          schema:
+            type: boolean
+            default: false
+        - name: comment_includes
+          in: query
+          description: "Return only spots where the comment includes the provided string (case-insensitive)."
+          required: false
+          schema:
+            type: string
       responses:
         '200':
           description: Success
@@ -241,6 +260,12 @@ paths:
               - WWBOTA
               - GMA
               - HEMA
+              - WCA
+              - MOTA
+              - SiOTA
+              - ARLHS
+              - ILLW
+              - ZLOTA
         - name: dx_continent
           in: query
           description: "Limit the alerts to only ones where the DX (the operator being spotted) is on the given continent(s). To select more than one continent, supply a comma-separated list."
@@ -667,6 +692,12 @@ components:
             - WWBOTA
             - GMA
             - HEMA
+            - WCA
+            - MOTA
+            - SiOTA
+            - ARLHS
+            - ILLW
+            - ZLOTA
           example: POTA
         sig_refs:
           type: array
@@ -812,6 +843,12 @@ components:
             - WWBOTA
             - GMA
             - HEMA
+            - WCA
+            - MOTA
+            - SiOTA
+            - ARLHS
+            - ILLW
+            - ZLOTA
           example: POTA
         sig_refs:
           type: array