diff --git a/src/negative_test/crucible-code-schema/not-a-send.json b/src/negative_test/crucible-code-schema/not-a-send.json
new file mode 100644
index 00000000000..9be1ede4cb3
--- /dev/null
+++ b/src/negative_test/crucible-code-schema/not-a-send.json
@@ -0,0 +1,3 @@
+{
+  "input": { "send": "shiftEnter" }
+}
diff --git a/src/schemas/json/crucible-code-schema.json b/src/schemas/json/crucible-code-schema.json
index 63826340646..6b698f3282f 100644
--- a/src/schemas/json/crucible-code-schema.json
+++ b/src/schemas/json/crucible-code-schema.json
@@ -66,6 +66,24 @@
       },
       "type": "object"
     },
+    "input": {
+      "additionalProperties": false,
+      "description": "What the keyboard does",
+      "properties": {
+        "$schema": {
+          "type": "string"
+        },
+        "$comment": {
+          "type": "string"
+        },
+        "send": {
+          "description": "Which press sends a prompt: enter sends and Shift+Enter, Alt+Enter or Ctrl+J opens a line; altEnter swaps the two, for a terminal that keeps Enter for itself",
+          "enum": ["enter", "altEnter"],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
     "output": {
       "additionalProperties": false,
       "description": "What the terminal shows",
diff --git a/src/test/crucible-code-schema/config.json b/src/test/crucible-code-schema/config.json
index e1c19609b1b..5ba98e91e34 100644
--- a/src/test/crucible-code-schema/config.json
+++ b/src/test/crucible-code-schema/config.json
@@ -12,6 +12,9 @@
     "CRUCIBLE_CODE_MOUSE_SCROLL_SPEED": "12",
     "RUST_LOG": "warn"
   },
+  "input": {
+    "send": "altEnter"
+  },
   "output": {
     "color": "auto",
     "glyphs": "unicode",