diff --git a/book.toml b/book.toml
index b2c0d11..f51dfa3 100644
--- a/book.toml
+++ b/book.toml
@@ -1,5 +1,5 @@
 [book]
-author = "The Rust Project Developers"
+authors = ["The Rust Project Developers"]
 title = "The Rustonomicon"
 description = "The Dark Arts of Advanced and Unsafe Rust Programming"
 
diff --git a/src/exception-safety.md b/src/exception-safety.md
index 762b38b..302ccd6 100644
--- a/src/exception-safety.md
+++ b/src/exception-safety.md
@@ -104,7 +104,7 @@ code and the unsafe code into two separate phases:
 ```text
 bubble_up(heap, index):
     let end_index = index;
-    while end_index != 0 && heap[end_index] < heap[parent(end_index)]:
+    while end_index != 0 && heap[index] < heap[parent(end_index)]:
         end_index = parent(end_index)
 
     let elem = heap[index]
diff --git a/src/ffi.md b/src/ffi.md
index 2f065a4..d88cfe2 100644
--- a/src/ffi.md
+++ b/src/ffi.md
@@ -25,7 +25,7 @@ libc = "0.2.0"
 
 Because [snappy](https://github.com/google/snappy) is a static library by default.
 So there is no C++ std linked in the output artifact. 
-n order to use this foreign library in Rust, we have to manually specify that we want to link stdc++ in our project.
+In order to use this foreign library in Rust, we have to manually specify that we want to link stdc++ in our project.
 The easiest way to do this is by setting up a build script.
 
 First edit `Cargo.toml`, inside `package` add `build = "build.rs"`:
@@ -90,7 +90,7 @@ The `extern` block can be extended to cover the entire snappy API:
 use libc::{c_int, size_t};
 
 #[link(name = "snappy")]
-unsafe extern {
+unsafe extern "C" {
     fn snappy_compress(input: *const u8,
                        input_length: size_t,
                        compressed: *mut u8,