diff --git a/modules/helper/README.md b/modules/helper/README.md
index 9f10d6e..cfe5c03 100644
--- a/modules/helper/README.md
+++ b/modules/helper/README.md
@@ -13,6 +13,11 @@ Functions
   - `is-callable` checks if a name is a command, function, or alias.
   - `is-true` checks a boolean variable for "true".
   - `coalesce` prints the first non-empty string in the arguments array.
+  - `is-darwin` checks if running on macOS Darwin.
+  - `is-linux` checks if running on Linux.
+  - `is-bsd` checks if running on BSD.
+  - `is-cygwin` checks if running on Cygwin (Windows).
+  - `is-termux` checks if running on Termux (Android).
 
 Authors
 -------
diff --git a/modules/helper/init.zsh b/modules/helper/init.zsh
index 0553556..0a33d7c 100644
--- a/modules/helper/init.zsh
+++ b/modules/helper/init.zsh
@@ -30,27 +30,27 @@ function coalesce {
   return 1
 }
 
-# is true on MacOS Darwin
+# Checks if running on macOS Darwin.
 function is-darwin {
   [[ "$OSTYPE" == darwin* ]]
 }
 
-# is true on Linux's
+# Checks if running on Linux.
 function is-linux {
   [[ "$OSTYPE" == linux* ]]
 }
 
-# is true on BSD's
+# Checks if running on BSD.
 function is-bsd {
   [[ "$OSTYPE" == *bsd* ]]
 }
 
-# is true on Cygwin (Windows)
+# Checks if running on Cygwin (Windows).
 function is-cygwin {
   [[ "$OSTYPE" == cygwin* ]]
 }
 
-# is true on termux (Android)
+# Checks if running on termux (Android).
 function is-termux {
   [[ "$OSTYPE" == linux-android ]]
 }