diff --git a/diff.c b/diff.c
index a872bdcac13e069cc4b694a414298e6c38d0dd3c..42858d4c7d058b876b0279bdefdb23850e8532ad 100644
--- a/diff.c
+++ b/diff.c
@@ -4123,6 +4123,9 @@ void diff_setup_done(struct diff_options *options)
 	if (count > 1)
 		die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
 
+	if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
+		die(_("-G, -S and --find-object are mutually exclusive"));
+
 	/*
 	 * Most of the time we can say "there are changes"
 	 * only by checking if there are changed paths, but
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index 72bb5a9514f3e806115d30cc669c7ab6855247fb..239ce5122b3a45bec211e0c20113385c0e37805d 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -251,7 +251,6 @@ void diffcore_pickaxe(struct diff_options *o)
 		}
 	}
 
-	/* Might want to warn when both S and G are on; I don't care... */
 	pickaxe(&diff_queued_diff, o, regexp, kws,
 		(opts & DIFF_PICKAXE_KIND_G) ? diff_grep : has_changes);