diff --git a/APIs/schemas/flow_audio_coded.json b/APIs/schemas/flow_audio_coded.json
index 6c4bc90..29c09ad 100644
--- a/APIs/schemas/flow_audio_coded.json
+++ b/APIs/schemas/flow_audio_coded.json
@@ -12,7 +12,7 @@
       ],
       "properties": {
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "pattern": "^audio\\/[^\\s\\/]+$",
           "not": {
diff --git a/APIs/schemas/flow_audio_raw.json b/APIs/schemas/flow_audio_raw.json
index ae19422..0a66126 100644
--- a/APIs/schemas/flow_audio_raw.json
+++ b/APIs/schemas/flow_audio_raw.json
@@ -13,7 +13,7 @@
       ],
       "properties": {
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "anyOf": [
             {
diff --git a/APIs/schemas/flow_data.json b/APIs/schemas/flow_data.json
index f662f9c..22813c4 100644
--- a/APIs/schemas/flow_data.json
+++ b/APIs/schemas/flow_data.json
@@ -21,7 +21,7 @@
           "format": "uri"
         },
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "pattern": "^[^\\s\\/]+\\/[^\\s\\/]+$",
           "not": {
diff --git a/APIs/schemas/flow_json_data.json b/APIs/schemas/flow_json_data.json
index 6778a17..d29f276 100644
--- a/APIs/schemas/flow_json_data.json
+++ b/APIs/schemas/flow_json_data.json
@@ -21,7 +21,7 @@
           "format": "uri"
         },
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "enum": [
             "application/json"
diff --git a/APIs/schemas/flow_mux.json b/APIs/schemas/flow_mux.json
index 266a717..c6cf26f 100644
--- a/APIs/schemas/flow_mux.json
+++ b/APIs/schemas/flow_mux.json
@@ -21,7 +21,7 @@
           "format": "uri"
         },
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "anyOf": [
             {
diff --git a/APIs/schemas/flow_sdianc_data.json b/APIs/schemas/flow_sdianc_data.json
index 5e45545..d3856d1 100644
--- a/APIs/schemas/flow_sdianc_data.json
+++ b/APIs/schemas/flow_sdianc_data.json
@@ -21,7 +21,7 @@
           "format": "uri"
         },
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "enum": [
             "video/smpte291"
diff --git a/APIs/schemas/flow_video_coded.json b/APIs/schemas/flow_video_coded.json
index a5bbd0d..d9c1ffc 100644
--- a/APIs/schemas/flow_video_coded.json
+++ b/APIs/schemas/flow_video_coded.json
@@ -12,7 +12,7 @@
       ],
       "properties": {
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "anyOf": [
             {
diff --git a/APIs/schemas/flow_video_raw.json b/APIs/schemas/flow_video_raw.json
index 793d865..d7f8db2 100644
--- a/APIs/schemas/flow_video_raw.json
+++ b/APIs/schemas/flow_video_raw.json
@@ -13,7 +13,7 @@
       ],
       "properties": {
         "media_type": {
-          "description": "Subclassification of the format using IANA assigned media types",
+          "description": "Subclassification of the format using IANA assigned media types, if available",
           "type": "string",
           "enum": [
             "video/raw"
diff --git a/APIs/schemas/receiver_audio.json b/APIs/schemas/receiver_audio.json
index d3497f6..0d38a72 100644
--- a/APIs/schemas/receiver_audio.json
+++ b/APIs/schemas/receiver_audio.json
@@ -25,7 +25,7 @@
           "type": "object",
           "properties": {
             "media_types": {
-              "description": "Subclassification of the formats accepted using IANA assigned media types",
+              "description": "Subclassification of the formats accepted using IANA assigned media types, if available",
               "type": "array",
               "minItems": 1,
               "items": {
diff --git a/APIs/schemas/receiver_data.json b/APIs/schemas/receiver_data.json
index 522392e..c0f0bb8 100644
--- a/APIs/schemas/receiver_data.json
+++ b/APIs/schemas/receiver_data.json
@@ -25,7 +25,7 @@
           "type": "object",
           "properties": {
             "media_types": {
-              "description": "Subclassification of the formats accepted using IANA assigned media types",
+              "description": "Subclassification of the formats accepted using IANA assigned media types, if available",
               "type": "array",
               "minItems": 1,
               "items": {
diff --git a/APIs/schemas/receiver_mux.json b/APIs/schemas/receiver_mux.json
index 58225c6..421078e 100644
--- a/APIs/schemas/receiver_mux.json
+++ b/APIs/schemas/receiver_mux.json
@@ -25,7 +25,7 @@
           "type": "object",
           "properties": {
             "media_types": {
-              "description": "Subclassification of the formats accepted using IANA assigned media types",
+              "description": "Subclassification of the formats accepted using IANA assigned media types, if available",
               "type": "array",
               "minItems": 1,
               "items": {
diff --git a/APIs/schemas/receiver_video.json b/APIs/schemas/receiver_video.json
index e11c584..779bb0b 100644
--- a/APIs/schemas/receiver_video.json
+++ b/APIs/schemas/receiver_video.json
@@ -25,7 +25,7 @@
           "type": "object",
           "properties": {
             "media_types": {
-              "description": "Subclassification of the formats accepted using IANA assigned media types",
+              "description": "Subclassification of the formats accepted using IANA assigned media types, if available",
               "type": "array",
               "minItems": 1,
               "items": {