diff --git a/package-lock.json b/package-lock.json
index a58130c..2baf05a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@nasa-jpl/seq-json-schema",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/package.json b/package.json
index 4fa098c..d6cc275 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@nasa-jpl/seq-json-schema",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "license": "MIT",
   "type": "module",
   "repository": {
diff --git a/schema.json b/schema.json
index ddb92f3..b60a133 100644
--- a/schema.json
+++ b/schema.json
@@ -1,5 +1,5 @@
 {
-  "$id": "https://github.com/NASA-AMMOS/seq-json-schema/tree/v1.2.0",
+  "$id": "https://github.com/NASA-AMMOS/seq-json-schema/tree/v1.3.0",
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$defs": {
     "immediate_activate": {
@@ -361,6 +361,36 @@
       "required": ["offset", "value", "variable"],
       "type": "object"
     },
+    "note": {
+      "additionalProperties": false,
+      "description": "Used to add a note within a sequence at a specific instant. Can be used by command & sequence simulator tools to print the string argument at the relevant instant within simulations.",
+      "properties": {
+        "string_arg": {
+          "description": "Note string arg.",
+          "type": "string"
+        },
+        "description": {
+          "$ref": "#/$defs/description"
+        },
+        "metadata": {
+          "$ref": "#/$defs/metadata"
+        },
+        "models": {
+          "items": {
+            "$ref": "#/$defs/model"
+          },
+          "type": "array"
+        },
+        "time": {
+          "$ref": "#/$defs/time"
+        },
+        "type": {
+          "const": "note"
+        }
+      },
+      "required": ["string_arg", "time", "type"],
+      "type": "object"
+    },
     "request": {
       "additionalProperties": false,
       "description": "Sequence steps can be grouped into a request, which can then be shifted or adjusted altogether as part of the request.",
@@ -420,6 +450,9 @@
         },
         {
           "$ref": "#/$defs/load"
+        },
+        {
+          "$ref": "#/$defs/note"
         }
       ]
     },
@@ -446,16 +479,30 @@
       "description": "Time object",
       "properties": {
         "tag": {
-          "description": "Relative or absolute time. Required for ABSOLUTE, COMMAND_RELATIVE, and EPOCH_RELATIVE time tags but not COMMAND_COMPLETE.",
+          "description": "Relative or absolute time. Required for ABSOLUTE, BLOCK_RELATIVE, COMMAND_RELATIVE, and EPOCH_RELATIVE time types but not COMMAND_COMPLETE.",
           "type": "string"
         },
         "type": {
-          "description": "Allowed time types: ABSOLUTE, COMMAND_RELATIVE, EPOCH_RELATIVE, or COMMAND_COMPLETE.",
-          "enum": ["ABSOLUTE", "COMMAND_RELATIVE", "EPOCH_RELATIVE", "COMMAND_COMPLETE"],
+          "description": "Allowed time types: ABSOLUTE, BLOCK_RELATIVE, COMMAND_RELATIVE, EPOCH_RELATIVE, or COMMAND_COMPLETE.",
+          "enum": ["ABSOLUTE", "BLOCK_RELATIVE", "COMMAND_RELATIVE", "EPOCH_RELATIVE", "COMMAND_COMPLETE"],
           "type": "string"
         }
       },
       "required": ["type"],
+      "allOf": [
+        {
+          "if": {
+            "properties": {
+              "type": {
+                "enum": ["ABSOLUTE", "BLOCK_RELATIVE", "COMMAND_RELATIVE", "EPOCH_RELATIVE"]
+              }
+            }
+          },
+          "then": {
+            "required": ["tag"]
+          }
+        }
+      ],
       "type": "object"
     },
     "variable_range": {
diff --git a/setup.py b/setup.py
index addd17e..45d3873 100644
--- a/setup.py
+++ b/setup.py
@@ -11,14 +11,15 @@
 version = loads(package_json).get('version')
 
 setup(
-  author='camargo',
-  author_email='Christopher.A.Camargo@jpl.nasa.gov',
+  author='cmak',
+  author_email='carter.mak@jpl.nasa.gov',
   description='Standardized JSON Schema for authoring multi-mission sequences',
   include_package_data=True,
   long_description=long_description,
   long_description_content_type='text/markdown',
   name='seq-json-schema',
   packages=['seq-json-schema'],
+  requires=['jsonschema'],
   url='https://github.com/NASA-AMMOS/seq-json-schema',
   version=version
 )
diff --git a/test/invalid-seq-json/time-missing-type-and-tag.seq.json b/test/invalid-seq-json/time-missing-type-and-tag.seq.json
new file mode 100644
index 0000000..ed9dde9
--- /dev/null
+++ b/test/invalid-seq-json/time-missing-type-and-tag.seq.json
@@ -0,0 +1,61 @@
+{
+  "id": "time_missing_type",
+  "metadata": {},
+  "steps": [
+    {
+      "args": [
+        { "type": "number", "value": 30 }
+      ],
+      "description": "Epoch-relative activate step for test.mod into engine 2 with missing time type.",
+      "engine": 2,
+      "epoch": "TEST_EPOCH",
+      "sequence": "d:/eng/test.mod",
+      "time": { "tag": "00:00:01.000" },
+      "type": "activate"
+    },
+    {
+      "args": [
+        { "type": "number", "value": 30 }
+      ],
+      "description": "Command-relative activate step for test.mod into engine 2 with missing time tag.",
+      "engine": 2,
+      "epoch": "TEST_EPOCH",
+      "sequence": "d:/eng/test.mod",
+      "time": { "type": "COMMAND_RELATIVE" },
+      "type": "activate"
+    },
+    {
+      "args": [
+        { "type": "number", "value": 30 }
+      ],
+      "description": "Absolute activate step for test.mod into engine 2 with missing time tag.",
+      "engine": 2,
+      "epoch": "TEST_EPOCH",
+      "sequence": "d:/eng/test.mod",
+      "time": { "type": "ABSOLUTE" },
+      "type": "activate"
+    },
+        {
+      "args": [
+        { "type": "number", "value": 30 }
+      ],
+      "description": "Block-relative activate step for test.mod into engine 2 with missing time tag.",
+      "engine": 2,
+      "epoch": "TEST_EPOCH",
+      "sequence": "d:/eng/test.mod",
+      "time": { "type": "BLOCK_RELATIVE" },
+      "type": "activate"
+    },
+        {
+      "args": [
+        { "type": "number", "value": 30 }
+      ],
+      "description": "Epoch-relative activate step for test.mod into engine 2 with missing time tag.",
+      "engine": 2,
+      "epoch": "TEST_EPOCH",
+      "sequence": "d:/eng/test.mod",
+      "time": { "type": "EPOCH_RELATIVE" },
+      "type": "activate"
+    }
+  ]
+}
diff --git a/test/valid-seq-json/all-possible-fields.seq.json b/test/valid-seq-json/all-possible-fields.seq.json
index a82da6a..77c00e6 100644
--- a/test/valid-seq-json/all-possible-fields.seq.json
+++ b/test/valid-seq-json/all-possible-fields.seq.json
@@ -254,11 +254,40 @@
           "time": { "tag": "00:00:01.000", "type": "COMMAND_RELATIVE" },
           "type": "command",
           "args": []
+        },
+        {
+          "description": "Note step with all possible fields.",
+          "models": [
+            {
+              "offset": "00:00:00.000",
+              "variable": "model_var_float",
+              "value": "1.234"
+            },
+            {
+              "offset": "00:00:00.001",
+              "variable": "model_var_int",
+              "value": "-1234"
+            },
+            {
+              "offset": "01:02:03.000",
+              "variable": "model_var_string",
+              "value": "Model test string"
+            },
+            {
+              "offset": "10:00:00.000",
+              "variable": "model_var_uint",
+              "value": "1234"
+            }
+          ],
+          "string_arg": "Note Test.",
+          "time": { "type": "BLOCK_RELATIVE" , "tag":  "00:30:00"},
+          "type": "note",
+          "metadata": { "listfield": ["1", 2] }
         }
-      ],
-      "time": { "tag": "2020-173T20:00:00.000", "type": "ABSOLUTE" },
-      "type": "request"
-    },
+          ],
+          "time": { "tag": "2020-173T20:00:00.000", "type": "ABSOLUTE" },
+          "type": "request"
+        },
     {
       "description": "Ground-epoch timed request object with all possible fields",
       "ground_epoch": { "delta": "+00:30:00", "name": "test_ground_epoch" },
diff --git a/test/invalid-seq-json/time-missing-type.seq.json b/test/valid-seq-json/note-valid.json
similarity index 54%
rename from test/invalid-seq-json/time-missing-type.seq.json
rename to test/valid-seq-json/note-valid.json
index 68dbb92..136c3ce 100644
--- a/test/invalid-seq-json/time-missing-type.seq.json
+++ b/test/valid-seq-json/note-valid.json
@@ -1,17 +1,9 @@
 {
-  "id": "time_missing_type",
+  "id": "note",
   "metadata": {},
   "steps": [
     {
-      "args": [
-        { "type": "number", "value": 30 },
-        { "type": "number", "value": 4.3 },
-        { "type": "boolean", "value": false },
-        { "type": "string", "value": "test_string" }
-      ],
-      "description": "Epoch-relative activate step for test.mod into engine 2 with all possible fields.",
-      "engine": 2,
-      "epoch": "TEST_EPOCH",
+      "description": "Note step with all possible fields.",
       "models": [
         {
           "offset": "00:00:00.000",
@@ -34,9 +26,10 @@
           "value": "1234"
         }
       ],
-      "sequence": "d:/eng/test.mod",
-      "time": { "tag": "00:00:01.000" },
-      "type": "activate"
+      "string_arg": "Note Test.",
+      "time": { "type": "BLOCK_RELATIVE", "tag": "00:30:00" },
+      "type": "note",
+      "metadata": { "listfield": ["1", 2] }
     }
   ]
 }