diff --git a/post.go b/post.go
index 225bda7..4e1f11f 100644
--- a/post.go
+++ b/post.go
@@ -1,266 +1,301 @@
 package writeas
 
 import (
 	"fmt"
 	"net/http"
 	"time"
 )
 
 type (
 	// Post represents a published Write.as post, whether anonymous, owned by a
 	// user, or part of a collection.
 	Post struct {
 		ID        string    `json:"id"`
 		Slug      string    `json:"slug"`
 		Token     string    `json:"token"`
 		Font      string    `json:"appearance"`
 		Language  *string   `json:"language"`
 		RTL       *bool     `json:"rtl"`
 		Listed    bool      `json:"listed"`
 		Created   time.Time `json:"created"`
 		Updated   time.Time `json:"updated"`
 		Title     string    `json:"title"`
 		Content   string    `json:"body"`
 		Views     int64     `json:"views"`
 		Tags      []string  `json:"tags"`
 		Images    []string  `json:"images"`
 		OwnerName string    `json:"owner,omitempty"`
 
 		Collection *Collection `json:"collection,omitempty"`
 	}
 
 	// OwnedPostParams are, together, fields only the original post author knows.
 	OwnedPostParams struct {
 		ID    string `json:"-"`
 		Token string `json:"token,omitempty"`
 	}
 
 	// PostParams holds values for creating or updating a post.
 	PostParams struct {
 		// Parameters only for updating
 		ID    string `json:"-"`
 		Token string `json:"token,omitempty"`
 
 		// Parameters for creating or updating
 		Title    string  `json:"title,omitempty"`
 		Content  string  `json:"body,omitempty"`
 		Font     string  `json:"font,omitempty"`
 		IsRTL    *bool   `json:"rtl,omitempty"`
 		Language *string `json:"lang,omitempty"`
 
 		// Parameters only for creating
 		Crosspost []map[string]string `json:"crosspost,omitempty"`
 
 		// Parameters for collection posts
 		Collection string `json:"-"`
 	}
 
 	// PinnedPostParams holds values for pinning a post
 	PinnedPostParams struct {
 		ID       string `json:"id"`
 		Position int    `json:"position"`
 	}
 
 	// BatchPostResult contains the post-specific result as part of a larger
 	// batch operation.
 	BatchPostResult struct {
 		ID           string `json:"id,omitempty"`
 		Code         int    `json:"code,omitempty"`
 		ErrorMessage string `json:"error_msg,omitempty"`
 	}
 
 	// ClaimPostResult contains the post-specific result for a request to
 	// associate a post to an account.
 	ClaimPostResult struct {
 		ID           string `json:"id,omitempty"`
 		Code         int    `json:"code,omitempty"`
 		ErrorMessage string `json:"error_msg,omitempty"`
 		Post         *Post  `json:"post,omitempty"`
 	}
 )
 
 // GetPost retrieves a published post, returning the Post and any error (in
 // user-friendly form) that occurs. See
 // https://developer.write.as/docs/api/#retrieve-a-post.
 func (c *Client) GetPost(id string) (*Post, error) {
 	p := &Post{}
 	env, err := c.get(fmt.Sprintf("/posts/%s", id), p)
 	if err != nil {
 		return nil, err
 	}
 
 	var ok bool
 	if p, ok = env.Data.(*Post); !ok {
 		return nil, fmt.Errorf("Wrong data returned from API.")
 	}
 	status := env.Code
 
 	if status == http.StatusOK {
 		return p, nil
 	} else if status == http.StatusNotFound {
 		return nil, fmt.Errorf("Post not found.")
 	} else if status == http.StatusGone {
 		return nil, fmt.Errorf("Post unpublished.")
 	}
 	return nil, fmt.Errorf("Problem getting post: %d. %v\n", status, err)
 }
 
 // CreatePost publishes a new post, returning a user-friendly error if one comes
 // up. See https://developer.write.as/docs/api/#publish-a-post.
 func (c *Client) CreatePost(sp *PostParams) (*Post, error) {
 	p := &Post{}
 	endPre := ""
 	if sp.Collection != "" {
 		endPre = "/collections/" + sp.Collection
 	}
 	env, err := c.post(endPre+"/posts", sp, p)
 	if err != nil {
 		return nil, err
 	}
 
 	var ok bool
 	if p, ok = env.Data.(*Post); !ok {
 		return nil, fmt.Errorf("Wrong data returned from API.")
 	}
 
 	status := env.Code
 	if status == http.StatusCreated {
 		return p, nil
 	} else if status == http.StatusBadRequest {
 		return nil, fmt.Errorf("Bad request: %s", env.ErrorMessage)
 	} else {
 		return nil, fmt.Errorf("Problem getting post: %d. %v\n", status, err)
 	}
 }
 
 // UpdatePost updates a published post with the given PostParams. See
 // https://developer.write.as/docs/api/#update-a-post.
 func (c *Client) UpdatePost(sp *PostParams) (*Post, error) {
 	p := &Post{}
 	env, err := c.put(fmt.Sprintf("/posts/%s", sp.ID), sp, p)
 	if err != nil {
 		return nil, err
 	}
 
 	var ok bool
 	if p, ok = env.Data.(*Post); !ok {
 		return nil, fmt.Errorf("Wrong data returned from API.")
 	}
 
 	status := env.Code
 	if status == http.StatusOK {
 		return p, nil
 	} else if c.isNotLoggedIn(status) {
 		return nil, fmt.Errorf("Not authenticated.")
 	} else if status == http.StatusBadRequest {
 		return nil, fmt.Errorf("Bad request: %s", env.ErrorMessage)
 	}
 	return nil, fmt.Errorf("Problem getting post: %d. %v\n", status, err)
 }
 
 // DeletePost permanently deletes a published post. See
 // https://developer.write.as/docs/api/#delete-a-post.
 func (c *Client) DeletePost(sp *PostParams) error {
 	env, err := c.delete(fmt.Sprintf("/posts/%s", sp.ID), map[string]string{
 		"token": sp.Token,
 	})
 	if err != nil {
 		return err
 	}
 
 	status := env.Code
 	if status == http.StatusNoContent {
 		return nil
 	} else if c.isNotLoggedIn(status) {
 		return fmt.Errorf("Not authenticated.")
 	} else if status == http.StatusBadRequest {
 		return fmt.Errorf("Bad request: %s", env.ErrorMessage)
 	}
 	return fmt.Errorf("Problem getting post: %d. %v\n", status, err)
 }
 
 // ClaimPosts associates anonymous posts with a user / account.
 // https://developer.write.as/docs/api/#claim-posts.
 func (c *Client) ClaimPosts(sp *[]OwnedPostParams) (*[]ClaimPostResult, error) {
 	p := &[]ClaimPostResult{}
 	env, err := c.put("/posts/claim", sp, p)
 	if err != nil {
 		return nil, err
 	}
 
 	var ok bool
 	if p, ok = env.Data.(*[]ClaimPostResult); !ok {
 		return nil, fmt.Errorf("Wrong data returned from API.")
 	}
 
 	status := env.Code
 	if status == http.StatusOK {
 		return p, nil
 	} else if c.isNotLoggedIn(status) {
 		return nil, fmt.Errorf("Not authenticated.")
 	} else if status == http.StatusBadRequest {
 		return nil, fmt.Errorf("Bad request: %s", env.ErrorMessage)
 	} else {
 		return nil, fmt.Errorf("Problem getting post: %d. %v\n", status, err)
 	}
 	// TODO: does this also happen with moving posts?
 }
 
 // GetUserPosts retrieves the authenticated user's posts.
 // See https://developers.write.as/docs/api/#retrieve-user-39-s-posts
 func (c *Client) GetUserPosts() (*[]Post, error) {
 	p := &[]Post{}
 	env, err := c.get("/me/posts", p)
 	if err != nil {
 		return nil, err
 	}
 
 	var ok bool
 	if p, ok = env.Data.(*[]Post); !ok {
 		return nil, fmt.Errorf("Wrong data returned from API.")
 	}
 	status := env.Code
 
 	if status != http.StatusOK {
 		if c.isNotLoggedIn(status) {
 			return nil, fmt.Errorf("Not authenticated.")
 		}
 		return nil, fmt.Errorf("Problem getting posts: %d. %v\n", status, err)
 	}
 	return p, nil
 }
 
 // PinPost pins a post in the given collection.
 // See https://developers.write.as/docs/api/#pin-a-post-to-a-collection
 func (c *Client) PinPost(alias string, pp *PinnedPostParams) error {
 	res := &[]BatchPostResult{}
 	env, err := c.post(fmt.Sprintf("/collections/%s/pin", alias), []*PinnedPostParams{pp}, res)
 	if err != nil {
 		return err
 	}
 
 	var ok bool
 	if res, ok = env.Data.(*[]BatchPostResult); !ok {
 		return fmt.Errorf("Wrong data returned from API.")
 	}
 
 	// Check for basic request errors on top level response
 	status := env.Code
 	if status != http.StatusOK {
 		if c.isNotLoggedIn(status) {
 			return fmt.Errorf("Not authenticated.")
 		}
 		return fmt.Errorf("Problem pinning post: %d. %v\n", status, err)
 	}
 
 	// Check the individual post result
 	if len(*res) == 0 || len(*res) > 1 {
 		return fmt.Errorf("Wrong data returned from API.")
 	}
 	if (*res)[0].Code != http.StatusOK {
 		return fmt.Errorf("Problem pinning post: %d", (*res)[0].Code)
 		// TODO: return ErrorMessage (right now it'll be empty)
 		// return fmt.Errorf("Problem pinning post: %v", res[0].ErrorMessage)
 	}
 	return nil
 }
+
+// UnpinPost unpins a post from the given collection.
+// See https://developers.write.as/docs/api/#unpin-a-post-from-a-collection
+func (c *Client) UnpinPost(alias string, pp *PinnedPostParams) error {
+	res := &[]BatchPostResult{}
+	env, err := c.post(fmt.Sprintf("/collections/%s/unpin", alias), []*PinnedPostParams{pp}, res)
+	if err != nil {
+		return err
+	}
+
+	var ok bool
+	if res, ok = env.Data.(*[]BatchPostResult); !ok {
+		return fmt.Errorf("Wrong data returned from API.")
+	}
+
+	// Check for basic request errors on top level response
+	status := env.Code
+	if status != http.StatusOK {
+		if c.isNotLoggedIn(status) {
+			return fmt.Errorf("Not authenticated.")
+		}
+		return fmt.Errorf("Problem unpinning post: %d. %v\n", status, err)
+	}
+
+	// Check the individual post result
+	if len(*res) == 0 || len(*res) > 1 {
+		return fmt.Errorf("Wrong data returned from API.")
+	}
+	if (*res)[0].Code != http.StatusOK {
+		return fmt.Errorf("Problem unpinning post: %d", (*res)[0].Code)
+		// TODO: return ErrorMessage (right now it'll be empty)
+		// return fmt.Errorf("Problem unpinning post: %v", res[0].ErrorMessage)
+	}
+	return nil
+}
diff --git a/post_test.go b/post_test.go
index 11562d6..358fe3e 100644
--- a/post_test.go
+++ b/post_test.go
@@ -1,106 +1,120 @@
 package writeas
 
 import (
 	"testing"
 
 	"fmt"
 	"strings"
 )
 
 func TestCreatePost(t *testing.T) {
 	wac := NewClient()
 	p, err := wac.CreatePost(&PostParams{
 		Title:   "Title!",
 		Content: "This is a post.",
 		Font:    "sans",
 	})
 	if err != nil {
 		t.Errorf("Post create failed: %v", err)
 		return
 	}
 	t.Logf("Post created: %+v", p)
 
 	token := p.Token
 
 	// Update post
 	p, err = wac.UpdatePost(&PostParams{
 		OwnedPostParams: OwnedPostParams{
 			ID:    p.ID,
 			Token: token,
 		},
 		Content: "Now it's been updated!",
 	})
 	if err != nil {
 		t.Errorf("Post update failed: %v", err)
 		return
 	}
 	t.Logf("Post updated: %+v", p)
 
 	// Delete post
 	err = wac.DeletePost(&PostParams{
 		OwnedPostParams: OwnedPostParams{
 			ID:    p.ID,
 			Token: token,
 		},
 	})
 	if err != nil {
 		t.Errorf("Post delete failed: %v", err)
 		return
 	}
 	t.Logf("Post deleted!")
 }
 
 func TestGetPost(t *testing.T) {
 	dwac := NewDevClient()
 	res, err := dwac.GetPost("zekk5r9apum6p")
 	if err != nil {
 		t.Errorf("Unexpected fetch results: %+v, err: %v\n", res, err)
 	} else {
 		t.Logf("Post: %+v", res)
 		if res.Content != "This is a post." {
 			t.Errorf("Unexpected fetch results: %+v\n", res)
 		}
 	}
 
 	wac := NewClient()
 	res, err = wac.GetPost("3psnxyhqxy3hq")
 	if err != nil {
 		t.Errorf("Unexpected fetch results: %+v, err: %v\n", res, err)
 	} else {
 		if !strings.HasPrefix(res.Content, "                               Write.as Blog") {
 			t.Errorf("Unexpected fetch results: %+v\n", res)
 		}
 	}
 }
 
 func TestPinPost(t *testing.T) {
 	dwac := NewDevClient()
 	_, err := dwac.LogIn("demo", "demo")
 	if err != nil {
 		t.Fatalf("Unable to log in: %v", err)
 	}
 	defer dwac.LogOut()
 
 	err = dwac.PinPost("tester", &PinnedPostParams{ID: "olx6uk7064heqltf"})
 	if err != nil {
 		t.Fatalf("Pin failed: %v", err)
 	}
 }
 
+func TestUnpinPost(t *testing.T) {
+	dwac := NewDevClient()
+	_, err := dwac.LogIn("demo", "demo")
+	if err != nil {
+		t.Fatalf("Unable to log in: %v", err)
+	}
+	defer dwac.LogOut()
+
+	err = dwac.UnpinPost("tester", &PinnedPostParams{ID: "olx6uk7064heqltf"})
+	if err != nil {
+		t.Fatalf("Unpin failed: %v", err)
+	}
+}
+
 func ExampleClient_CreatePost() {
 	c := NewClient()
 
 	// Publish a post
 	p, err := c.CreatePost(&PostParams{
 		Title:   "Title!",
 		Content: "This is a post.",
 		Font:    "sans",
 	})
 	if err != nil {
 		fmt.Printf("Unable to create: %v", err)
 		return
 	}
 
 	fmt.Printf("%s", p.Content)
 	// Output: This is a post.
 }