diff --git a/src/command.ts b/src/command.ts
index 2796fce..8b3dda0 100644
--- a/src/command.ts
+++ b/src/command.ts
@@ -11,14 +11,37 @@ export interface CommandProperties {
 }
 
 /**
- * Commands
+ * Issues a command to the GitHub Actions runner
+ *
+ * @param command - The command name to issue
+ * @param properties - Additional properties for the command (key-value pairs)
+ * @param message - The message to include with the command
+ * @remarks
+ * This function outputs a specially formatted string to stdout that the Actions
+ * runner interprets as a command. These commands can control workflow behavior,
+ * set outputs, create annotations, mask values, and more.
  *
  * Command Format:
  *   ::name key=value,key=value::message
  *
- * Examples:
- *   ::warning::This is the message
- *   ::set-env name=MY_VAR::some value
+ * @example
+ * ```typescript
+ * // Issue a warning annotation
+ * issueCommand('warning', {}, 'This is a warning message');
+ * // Output: ::warning::This is a warning message
+ *
+ * // Set an environment variable
+ * issueCommand('set-env', { name: 'MY_VAR' }, 'some value');
+ * // Output: ::set-env name=MY_VAR::some value
+ *
+ * // Add a secret mask
+ * issueCommand('add-mask', {}, 'secretValue123');
+ * // Output: ::add-mask::secretValue123
+ * ```
+ *
+ * @internal
+ * This is an internal utility function that powers the public API functions
+ * such as setSecret, warning, error, and exportVariable.
  */
 export function issueCommand(
   command: string,
diff --git a/src/core.ts b/src/core.ts
index 0a14169..e9091ba 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -94,7 +94,32 @@ export function exportVariable(name: string, val: any): void {
 
 /**
  * Registers a secret which will get masked from logs
- * @param secret value of the secret
+ *
+ * @param secret - Value of the secret to be masked
+ * @remarks
+ * This function instructs the Actions runner to mask the specified value in any
+ * logs produced during the workflow run. Once registered, the secret value will
+ * be replaced with asterisks (***) whenever it appears in console output, logs,
+ * or error messages.
+ *
+ * This is useful for protecting sensitive information such as:
+ * - API keys
+ * - Access tokens
+ * - Authentication credentials
+ * - URL parameters containing signatures (SAS tokens)
+ *
+ * Note that masking only affects future logs; any previous appearances of the
+ * secret in logs before calling this function will remain unmasked.
+ *
+ * @example
+ * ```typescript
+ * // Register an API token as a secret
+ * const apiToken = "abc123xyz456";
+ * setSecret(apiToken);
+ *
+ * // Now any logs containing this value will show *** instead
+ * console.log(`Using token: ${apiToken}`); // Outputs: "Using token: ***"
+ * ```
  */
 export function setSecret(secret: string): void {
   issueCommand('add-mask', {}, secret)