diff --git a/README.md b/README.md
index 14adf80..9d01e0b 100644
--- a/README.md
+++ b/README.md
@@ -18,9 +18,9 @@ snippet from [percol](https://github.com/mooz/percol).
 ## Requirements
 
 - [peco](https://github.com/peco/peco)
-- [psh](http://www.zsh.org/)
+- [zsh](https://www.zsh.org/)
 - `tac`, or `tail` with support for `-r` option.
-- `perl`, `awk`, or `uniq` for if de-duplication is turned on.
+- `perl`, `awk`, or `uniq` if de-duplication is turned on.
 
 ## Installation
 
@@ -131,4 +131,4 @@ what my `~/.peco/config.json` file looks like:
 
 ## License
 
-[CC0 1.0 Universal](http://creativecommons.org/publicdomain/zero/1.0/)
+[CC0 1.0 Universal](https://creativecommons.org/publicdomain/zero/1.0/)
diff --git a/zsh-peco-history.zsh b/zsh-peco-history.zsh
index 8045c6b..1bc58fc 100644
--- a/zsh-peco-history.zsh
+++ b/zsh-peco-history.zsh
@@ -5,8 +5,9 @@
 #
 # Requirements:
 #  - peco: https://github.com/peco/peco
+#  - zsh: https://www.zsh.org/
 #  - tac, or tail with support for -r option
-#  - perl, awk, or uniq for if de-duplication is turned on
+#  - perl, awk, or uniq if de-duplication is turned on
 #
 # Based on: https://github.com/mooz/percol#zsh-history-search