Fix typo
diff --git a/include/git2/diff.h b/include/git2/diff.h
index 505c3e7..5d360be 100644
--- a/include/git2/diff.h
+++ b/include/git2/diff.h
@@ -853,7 +853,7 @@ typedef enum {
* iteration and cause this return `GIT_EUSER`.
*
* @param diff A git_diff generated by one of the above functions.
- * @param format A git_diff_forrmat_t value to pick the text format.
+ * @param format A git_diff_format_t value to pick the text format.
* @param print_cb Callback to make per line of diff text.
* @param payload Reference pointer that will be passed to your callback.
* @return 0 on success, GIT_EUSER on non-zero callback, or error code