1 files changed, 2 insertions, 1 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkActionFactory.java b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkActionFactory.java
index 4bf9999f50..327c73697c 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkActionFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkActionFactory.java
@@ -950,7 +950,8 @@ public class SkylarkActionFactory implements SkylarkValue {
           noneable = true,
           doc =
               "The passed objects are passed through a map function. "
-                  + "For vector args the function is given a list and is expected to return a list."
+                  + "For vector args the function is given a list and is expected to "
+                  + "return a list of the same length as the input."
         )
       },
       useLocation = true