diff --git a/backend/project/endpoints/index/OpenAPI_Object.json b/backend/project/endpoints/index/OpenAPI_Object.json
index 7243ff59..7b855bbd 100644
--- a/backend/project/endpoints/index/OpenAPI_Object.json
+++ b/backend/project/endpoints/index/OpenAPI_Object.json
@@ -41,5 +41,376 @@
       }
     ]
   },
-  "paths": []
+  "paths": {
+    "/submissions/{uid}/{pid}": {
+      "get": {
+        "summary": "Get all submissions from a user for a project",
+        "responses": {
+          "200": {
+            "description": "A list of submission URLs",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "submissions": {
+                      "type": "array",
+                      "items": {
+                        "type": "string"
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "A 'not found' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "An error message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      },
+      "post": {
+        "summary": "Post a new submission to a project",
+        "requestBody": {
+          "description": "Grading",
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "properties": {
+                  "grading": {
+                    "type": "int",
+                    "minimum": 0,
+                    "maximum": 20
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "201": {
+            "description": "The newly created submission URL",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "submission": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "A 'bad data field' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "A 'not found' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "An error message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      },
+      "parameters": [
+        {
+          "name": "uid",
+          "in": "path",
+          "description": "User ID",
+          "required": true,
+          "schema": {
+            "type": "string"
+          }
+        },
+        {
+          "name": "pid",
+          "in": "path",
+          "description": "Project ID",
+          "required": true,
+          "schema": {
+            "type": "int"
+          }
+        }
+      ]
+    },
+    "/submissions/{sid}": {
+      "get": {
+        "summary": "Get the submission",
+        "responses": {
+          "200": {
+            "description": "The submission",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "submission_id": {
+                      "type": "int"
+                    },
+                    "uid": {
+                      "type": "string"
+                    },
+                    "project_id": {
+                      "type": "int"
+                    },
+                    "grading": {
+                      "type": "int"
+                    },
+                    "submission_time": {
+                      "type": "string"
+                    },
+                    "submission_path": {
+                      "type": "string"
+                    },
+                    "submission_status": {
+                      "type": "int"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "A 'not found' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "An error message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      },
+      "patch": {
+        "summary": "Update the submission",
+        "requestBody": {
+          "description": "The submission data",
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "properties": {
+                  "grading": {
+                    "type": "int",
+                    "minimum": 0,
+                    "maximum": 20
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "A 'submission updated' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "A 'bad data field' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "A 'not found' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "An error message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      },
+      "delete": {
+        "summary": "Delete the submission",
+        "responses": {
+          "200": {
+            "description": "A 'submission deleted' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "A 'not found' message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "An error message",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "message": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      },
+      "parameters": [
+        {
+          "name": "sid",
+          "in": "path",
+          "description": "Submission ID",
+          "required": true,
+          "schema": {
+            "type": "int"
+          }
+        }
+      ]
+    }
+  }
 }
diff --git a/backend/project/endpoints/submissions.py b/backend/project/endpoints/submissions.py
index caf8b5b2..f6c4e4d8 100644
--- a/backend/project/endpoints/submissions.py
+++ b/backend/project/endpoints/submissions.py
@@ -126,10 +126,6 @@ def post(self, uid: str, pid: int) -> dict[str, any]:
             return {"message": f"An error occurred while creating a new submission "
                 f"for user {uid} in project {pid}"}, 500
 
-submissions_bp.add_url_rule(
-    "/submissions/<string:uid>/<int:pid>",
-    view_func=Submissions.as_view("submissions"))
-
 class Submission(Resource):
     """API endpoint for the submission"""
 
@@ -218,7 +214,7 @@ def patch(self, sid:int) -> dict[str, any]:
 
                 # Save the submission
                 session.commit()
-                return {"message": "Submission {sid} updated"}
+                return {"message": f"Submission {sid} updated"}
         except Exception:
             session.rollback()
             return {"message": f"An error occurred while patching submission {sid}"}, 500
@@ -262,6 +258,9 @@ def delete(self, sid: int) -> dict[str, any]:
             db.session.rollback()
             return {"message": f"An error occurred while deleting submission {sid}"}, 500
 
+submissions_bp.add_url_rule(
+    "/submissions/<string:uid>/<int:pid>",
+    view_func=Submissions.as_view("submissions"))
 submissions_bp.add_url_rule(
     "/submissions/<int:sid>",
     view_func=Submission.as_view("submission"))