diff --git a/db.json b/db.json
index 9c7a37a4..a596a41c 100644
--- a/db.json
+++ b/db.json
@@ -168,7 +168,8 @@
     "compressible": true
   },
   "application/asyncapi+yaml": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/at+jwt": {
     "source": "iana"
@@ -361,7 +362,8 @@
     "compressible": true
   },
   "application/city+json-seq": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/clr": {
     "source": "iana"
@@ -459,7 +461,8 @@
     "compressible": true
   },
   "application/cwl+yaml": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/cwt": {
     "source": "iana"
@@ -748,10 +751,12 @@
     "extensions": ["geojson"]
   },
   "application/geo+json-seq": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/geofeed+csv": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/geopackage+sqlite3": {
     "source": "iana"
@@ -1538,10 +1543,12 @@
     "compressible": true
   },
   "application/prs.implied-object+json-seq": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/prs.implied-object+yaml": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/prs.implied-structure": {
     "source": "iana"
@@ -2031,7 +2038,8 @@
     "extensions": ["tsd"]
   },
   "application/tlsrpt+gzip": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": false
   },
   "application/tlsrpt+json": {
     "source": "iana",
@@ -2147,7 +2155,8 @@
     "extensions": ["vec"]
   },
   "application/vec-package+gzip": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": false
   },
   "application/vec-package+zip": {
     "source": "iana",
@@ -2899,7 +2908,8 @@
     "extensions": ["c11amz"]
   },
   "application/vnd.cncf.helm.chart.content.v1.tar+gzip": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": false
   },
   "application/vnd.cncf.helm.chart.provenance.v1.prov": {
     "source": "iana"
@@ -3466,7 +3476,8 @@
     "source": "iana"
   },
   "application/vnd.faf+yaml": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/vnd.familysearch.gedcom+zip": {
     "source": "iana",
@@ -4826,7 +4837,8 @@
     "compressible": true
   },
   "application/vnd.oai.workflows+yaml": {
-    "source": "iana"
+    "source": "iana",
+    "compressible": true
   },
   "application/vnd.oasis.opendocument.base": {
     "source": "iana"
diff --git a/src/custom-suffix.json b/src/custom-suffix.json
index 229b7a46..aa5ce2f1 100644
--- a/src/custom-suffix.json
+++ b/src/custom-suffix.json
@@ -1,12 +1,28 @@
 {
+  "+csv": {
+    "compressible": true,
+    "notes": "+csv means it is CSV, which is compressible."
+  },
+  "+gzip": {
+    "compressible": false,
+    "notes": "+gzip means it is a GZIP archive, which is not compressible."
+  },
   "+json": {
     "compressible": true,
     "notes": "+json means it is JSON, which is compressible."
   },
+  "+json-seq": {
+    "compressible": true,
+    "notes": "+json-seq means it is a JSON text sequence, which is compressible."
+  },
   "+xml": {
     "compressible": true,
     "notes": "+xml means it is XML, which is compressible."
   },
+  "+yaml": {
+    "compressible": true,
+    "notes": "+yaml means it is YAML, which is compressible."
+  },
   "+zip": {
     "compressible": false,
     "notes": "+zip means it is a ZIP archive, which is not compressible."