diff --git a/routes/actions.go b/routes/actions.go
index c5f07e8..fb24749 100644
--- a/routes/actions.go
+++ b/routes/actions.go
@@ -14,6 +14,7 @@ func newActionRouter(m *models.Model) http.Handler {
 	router.Get("/", getActionsFunc(m))
 	router.Post("/", postActionFunc(m))
 	router.Get("/{actionid}", getActionByIDFunc(m))
+	router.Put("/{actionid}", putActionFunc(m))
 	return router
 }
 
@@ -125,14 +126,23 @@ func postActionFunc(m *models.Model) http.HandlerFunc {
 	}
 }
 
+type updateActionResponse struct {
+	UpdatedAction *models.Action `json:"updated_action"`
+	ID            int64          `json:"id"`
+}
+
 func putActionFunc(m *models.Model) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-
+		id, err := strconv.Atoi(chi.URLParam(r, "actionid"))
+		if err != nil {
+			notFoundHandler(w, r)
+			return
+		}
 		r.Body = http.MaxBytesReader(w, r.Body, 1024)
 		dec := json.NewDecoder(r.Body)
 		dec.DisallowUnknownFields()
 		var a models.Action
-		err := dec.Decode(&a)
+		err = dec.Decode(&a)
 		if err != nil {
 			badRequestError(w, err)
 			return
@@ -149,8 +159,9 @@ func putActionFunc(m *models.Model) http.HandlerFunc {
 			CompletedChunks:   a.CompletedChunks,
 			CompletedOn:       a.CompletedOn,
 			PlanID:            a.PlanID,
+			ActionID:          int64(id),
 		}
-		id, err := m.AddAction(action)
+		err = m.SaveAction(action)
 		if err != nil {
 			serverError(w, err)
 			return
@@ -161,11 +172,11 @@ func putActionFunc(m *models.Model) http.HandlerFunc {
 			return
 		}
 
-		response := &createActionResponse{
-			CreatedAction: action,
+		response := &updateActionResponse{
+			UpdatedAction: action,
 			ID:            int64(id),
 		}
-		w.WriteHeader(http.StatusCreated)
+		w.WriteHeader(http.StatusOK)
 		w.Header().Add("Content-Type", "application/json")
 		if err := json.NewEncoder(w).Encode(response); err != nil {
 			serverError(w, err)
diff --git a/routes/put_action_test.go b/routes/put_action_test.go
new file mode 100644
index 0000000..5dc03b4
--- /dev/null
+++ b/routes/put_action_test.go
@@ -0,0 +1,236 @@
+package routes_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"gitea.deepak.science/deepak/gogmagog/models"
+	"gitea.deepak.science/deepak/gogmagog/routes"
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestPureJSONPutAction(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+	compOn, _ := time.Parse("2006-01-02", "2021-01-01")
+	a := &models.Action{
+		PlanID:            5,
+		CompletedOn:       &compOn,
+		EstimatedChunks:   3,
+		CompletedChunks:   2,
+		ActionDescription: "here's an action",
+	}
+	m := getModel([]*models.Plan{}, []*models.Action{a})
+	router := routes.NewRouter(m)
+	data := []byte(`{
+			"action_description": "here's an action",
+			"estimated_chunks": 3,
+			"completed_chunks": 2,
+			"completed_on": "2021-01-01T00:00:00Z",
+			"plan_id": 5
+		}`)
+	req, _ := http.NewRequest("PUT", "/actions/0", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := httptest.NewRecorder()
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusOK, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `{
+		"updated_action": {
+				"action_description": "here's an action",
+				"estimated_chunks": 3,
+				"completed_chunks": 2,
+				"completed_on": "2021-01-01T00:00:00Z",
+				"plan_id": 5,
+				"action_id": 0
+		},
+		"id": 0
+	}`
+	assert.JSONEq(expected, rr.Body.String())
+	contentType := rr.Header().Get("Content-Type")
+	assert.Equal("application/json", contentType)
+}
+
+func TestExtraFieldActionPutJSON(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	m := getModel([]*models.Plan{p}, []*models.Action{})
+	router := routes.NewRouter(m)
+	data := []byte(`{
+			"completed_on": "2021-01-01T00:00:00Z",
+			"plan_id": 5,
+			"sabotage": "omg"
+		}`)
+	req, _ := http.NewRequest("PUT", "/actions/1", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := httptest.NewRecorder()
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusBadRequest, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `Bad Request`
+	assert.Equal(expected, strings.TrimSpace(rr.Body.String()))
+}
+func TestEmptyBodyActionPut(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	m := getModel([]*models.Plan{p}, []*models.Action{})
+	router := routes.NewRouter(m)
+	data := []byte(``)
+	req, _ := http.NewRequest("PUT", "/actions/1", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := httptest.NewRecorder()
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusBadRequest, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `Bad Request`
+	assert.Equal(expected, strings.TrimSpace(rr.Body.String()))
+}
+
+func TestTwoBodyActionPut(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	m := getModel([]*models.Plan{p}, []*models.Action{})
+	router := routes.NewRouter(m)
+	data := []byte(`{
+			"plan_id": 5
+		}, {
+				"plan_id": 6
+			}`)
+	req, _ := http.NewRequest("PUT", "/actions/1", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := httptest.NewRecorder()
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusBadRequest, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `Bad Request`
+	assert.Equal(expected, strings.TrimSpace(rr.Body.String()))
+}
+
+func TestBadActionIDPut(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	m := getModel([]*models.Plan{p}, []*models.Action{})
+	router := routes.NewRouter(m)
+	data := []byte(`{
+			"plan_id": 5
+		}, {
+				"plan_id": 6
+			}`)
+	req, _ := http.NewRequest("PUT", "/actions/text", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := httptest.NewRecorder()
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusNotFound, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `Not Found`
+	assert.Equal(expected, strings.TrimSpace(rr.Body.String()))
+}
+
+func TestErrorUpdateAction(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+
+	m := getErrorModel("Model always errors")
+
+	router := routes.NewRouter(m)
+	a := &models.Action{PlanID: 6}
+	data, _ := json.Marshal(a)
+	req, _ := http.NewRequest("PUT", "/actions/1", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := httptest.NewRecorder()
+
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusInternalServerError, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `Internal Server Error`
+	assert.Equal(expected, strings.TrimSpace(rr.Body.String()))
+}
+
+func TestErrorOnRetrieveUpdateAction(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+
+	m := getErrorOnGetModel("Model always errors")
+
+	router := routes.NewRouter(m)
+	a := &models.Action{PlanID: 6}
+	data, _ := json.Marshal(a)
+	req, _ := http.NewRequest("PUT", "/actions/1", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+	rr := httptest.NewRecorder()
+
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusInternalServerError, status)
+	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
+	expected := `Internal Server Error`
+	assert.Equal(expected, strings.TrimSpace(rr.Body.String()))
+}
+
+func TestErrorWriterUpdateAction(t *testing.T) {
+	// set up
+	assert := assert.New(t)
+
+	a := &models.Action{PlanID: 6}
+	m := getModel([]*models.Plan{}, []*models.Action{a})
+
+	router := routes.NewRouter(m)
+	data, _ := json.Marshal(a)
+	req, _ := http.NewRequest("PUT", "/actions/1", bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+
+	rr := NewBadWriter()
+
+	// function under test
+	router.ServeHTTP(rr, req)
+
+	// check results
+	status := rr.Code
+	assert.Equal(http.StatusInternalServerError, status)
+
+}