diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -147,6 +147,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 *Libraries for configuration parsing*
 
 * [config](https://github.com/olebedev/config) - JSON or YAML configuration wrapper with environment variables and flags parsing.
+* [env](https://github.com/caarlos0/env) - Parse environment variables to Go structs (with defaults).
 * [envcfg](https://github.com/tomazk/envcfg) - Un-marshaling environment variables to Go structs.
 * [envconf](https://github.com/ian-kent/envconf) - Configuration from environment
 * [envconfig](https://github.com/vrischmann/envconfig) - Read your configuration from environment variables.