diff --git a/README.md b/README.md
index 271076b..ca85e6c 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Currently, this includes the following components:
   [CCSDS 301.0-B-4 3.2](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
 - CDS (CCSDS Day Segmented Time Code) implementation according to
   [CCSDS 301.0-B-4 3.3](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
-- Some helper types to support ASCII timecodes ad specified in
+- Some helper types to support ASCII timecodes as specified in
   [CCSDS 301.0-B-4 3.5](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
 
 # Features
diff --git a/src/lib.rs b/src/lib.rs
index fd0e193..a3b02e0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,7 +13,7 @@
 //!    [CCSDS 301.0-B-4 3.2](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
 //!  - CDS (CCSDS Day Segmented Time Code) implementation according to
 //!    [CCSDS 301.0-B-4 3.3](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
-//!  - Some helper types to support ASCII timecodes ad specified in
+//!  - Some helper types to support ASCII timecodes as specified in
 //!    [CCSDS 301.0-B-4 3.5](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
 //!
 //! ## Features