diff --git a/docs/configuration/configuration.md b/docs/configuration/configuration.md
index 004c8f78d..c8bfc23e8 100644
--- a/docs/configuration/configuration.md
+++ b/docs/configuration/configuration.md
@@ -2471,7 +2471,7 @@ anchored on both ends. To un-anchor the regex, use `.*<regex>.*`.
 * `keep`: Drop targets for which `regex` does not match the concatenated `source_labels`.
 * `drop`: Drop targets for which `regex` matches the concatenated `source_labels`.
 * `hashmod`: Set `target_label` to the `modulus` of a hash of the concatenated `source_labels`.
-* `labelmap`: Ignore `source_labels` and match `regex` against all source label names. Then
+* `labelmap`: Match `regex` against all source label names, not just those specified in `source_labels`. Then
    copy the values of the matching labels  to label names given by `replacement` with match
    group references (`${1}`, `${2}`, ...) in `replacement` substituted by their value.
 * `labeldrop`: Match `regex` against all label names. Any label that matches will be