diff --git a/arch/s390/README.md b/arch/s390/README.md
index 57e9ee8f..7b383cc9 100644
--- a/arch/s390/README.md
+++ b/arch/s390/README.md
@@ -213,8 +213,8 @@ DFLTCC is a non-privileged instruction, neither special VM/LPAR
 configuration nor root are required.
 
 zlib-ng CI uses an IBM-provided z15 self-hosted builder for the DFLTCC
-testing. There is no offical IBM Z builds of GitHub Actions runner, so
-we build one inspired by `anup-kodlekere/gaplib`.
+testing. There is no official IBM Z GitHub Actions runner, so we build
+one inspired by `anup-kodlekere/gaplib`.
 Future updates to actions-runner might need an updated patch. The .net
 version number patch has been separated into a separate file to avoid a
 need for constantly changing the patch.
diff --git a/deflate_stored.c b/deflate_stored.c
index b09029a2..9e5acfbf 100644
--- a/deflate_stored.c
+++ b/deflate_stored.c
@@ -22,7 +22,7 @@
  *
  * deflate_stored() is written to minimize the number of times an input byte is
  * copied. It is most efficient with large input and output buffers, which
- * maximizes the opportunites to have a single copy from next_in to next_out.
+ * maximizes the opportunities to have a single copy from next_in to next_out.
  */
 Z_INTERNAL block_state deflate_stored(deflate_state *s, int flush) {
     /* Smallest worthy block size when not flushing or finishing. By default