diff --git a/config.md b/config.md
index 88be15d1f..ad180dc8c 100644
--- a/config.md
+++ b/config.md
@@ -232,7 +232,7 @@ For POSIX platforms the `user` structure has the following fields:
 * **`additionalGids`** (array of ints, OPTIONAL) specifies additional group IDs in the [container namespace](glossary.md#container-namespace) to be added to the list of supplementary group IDs.
 
 On a POSIX platform, processes have both a 'base' GID (as specified in the `gid` field), and an array of supplementary group IDs as described in [IEEE Std 1003.1-2008][ieee-1003.1.2008-xbd-c3.378].
-Runtimes MUST ensure that all group IDs listed defined by `gid` and `additionalGids` are present in the array of supplementary group IDs.
+Runtimes MUST ensure that all group IDs specified by `gid` and `additionalGids` are present in the array of supplementary group IDs.
 Runtimes SHOULD preserve the order of `additionalGids`; when the base GID (as specified in the `gid` field) is absent from `additionalGids`, it SHOULD be positioned at the start of the supplementary group ID array.
 
 Entities which create a container using a runtime on a POSIX platform SHOULD duplicate the base GID (as specified in the `gid` field) as `additionalGids[0]`; this maximizes compatibility and consistency when using runtimes that target a previous version of this specification.