diff --git a/go/delivery/source.go b/go/delivery/source.go
index efa2e7f..b39596a 100644
--- a/go/delivery/source.go
+++ b/go/delivery/source.go
@@ -407,9 +407,9 @@ type Module struct {
 	Inputs2 *KeptInputs2 `json:"inputs2,omitempty"`
 	Src     uint64       `json:"src,omitempty"`
 	// FPSrc is the source revision at which FP2 last changed (novox/hq ADR 0601 §1): Src when a merge of the module's own
-	// repository moved it, the source revision of the moment when a recompute with no such merge moved it (a toolchain,
-	// a package, a base). The release that moved the source to it is the one that carries the build; 0 is not known, and
-	// no release is taken to carry it. Src and Commit stay where the module was last merged and say nothing of that.
+	// repository moved it, and 0 when a recompute with no merge moved it (a toolchain, a package, a base), since no release
+	// carries that build. The release that moved the source to it is the one that carries the build; 0 is not known, and no
+	// release is taken to carry it. Src and Commit stay where the module was last merged and say nothing of that.
 	FPSrc      uint64 `json:"fp-src,omitempty"`
 	Repository string `json:"repository"`
 	Commit     string `json:"commit"`