diff --git a/techlibs/common/opensta.cc b/techlibs/common/opensta.cc
index 2a806edf6..282481953 100644
--- a/techlibs/common/opensta.cc
+++ b/techlibs/common/opensta.cc
@@ -16,7 +16,9 @@ struct OpenstaPass : public Pass
 		log("\n");
 		log("    opensta [options]\n");
 		log("\n");
-		// TOOD
+		log("Expand SDC file with OpenSTA.\n");
+		log("Internal command like abc. Requires a well-formed design.\n");
+		log("For general SDC expansion with OpenSTA, use the sdc_expand command.\n");
 		log("\n");
 		log("    -exe <command>\n");
 		log("        use <command> to run OpenSTA instead of \"%s\"\n", default_opensta_cmd);
diff --git a/techlibs/common/sdc_expand.cc b/techlibs/common/sdc_expand.cc
index 95254d1f4..fe8f20aa9 100644
--- a/techlibs/common/sdc_expand.cc
+++ b/techlibs/common/sdc_expand.cc
@@ -7,7 +7,7 @@ PRIVATE_NAMESPACE_BEGIN
 
 struct SdcExpandPass : public ScriptPass
 {
-	SdcExpandPass() : ScriptPass("sdc_expand", "run OpenSTA") { }
+	SdcExpandPass() : ScriptPass("sdc_expand", "expand SDC design with opensta") { }
 
 	void help() override
 	{
@@ -15,7 +15,8 @@ struct SdcExpandPass : public ScriptPass
 		log("\n");
 		log("    sdc_expand [options]\n");
 		log("\n");
-		// TODO
+		log("Expand SDC file with opensta based on arbitrary current design.\n");
+		log("Changes the design but only temporarily.\n");
 		log("\n");
 		log("    -exe <command>\n");
 		log("        use <command> to run OpenSTA instead of \"%s\"\n", default_opensta_cmd);