diff --git a/modules/nextflow/src/main/groovy/nextflow/Nextflow.groovy b/modules/nextflow/src/main/groovy/nextflow/Nextflow.groovy
index b114cb5d4d..e7dc15884c 100644
--- a/modules/nextflow/src/main/groovy/nextflow/Nextflow.groovy
+++ b/modules/nextflow/src/main/groovy/nextflow/Nextflow.groovy
@@ -61,6 +61,9 @@ class Nextflow {
      * Get the value of an environment variable from the launch environment.
      *
      * @param name
+     *      The environment variable name to be referenced
+     * @return
+     *      The value associate with the specified variable name or {@code null} if the variable does not exist.
      */
     static String env(String name) {
         return SysEnv.get(name)
diff --git a/modules/nextflow/src/main/groovy/nextflow/config/ConfigBase.groovy b/modules/nextflow/src/main/groovy/nextflow/config/ConfigBase.groovy
index 0c6597f7b6..a97e23f19a 100644
--- a/modules/nextflow/src/main/groovy/nextflow/config/ConfigBase.groovy
+++ b/modules/nextflow/src/main/groovy/nextflow/config/ConfigBase.groovy
@@ -78,6 +78,9 @@ abstract class ConfigBase extends Script {
      * Get the value of an environment variable from the launch environment.
      *
      * @param name
+     *      The environment variable name to be referenced
+     * @return
+     *      The value associate with the specified variable name or {@code null} if the variable does not exist.
      */
     String env(String name) {
         return SysEnv.get(name)