diff --git a/sub_commands/count_main_cmdline.yaggo b/sub_commands/count_main_cmdline.yaggo
index f362e39..a7514af 100644
--- a/sub_commands/count_main_cmdline.yaggo
+++ b/sub_commands/count_main_cmdline.yaggo
@@ -5,7 +5,7 @@ option("mer-len", "m") {
   description "Length of mer"
   uint32; required }
 option("size", "s") {
-  description "Initial hash size"
+  description "Initial hash size in bytes"
   uint64; suffix; required }
 option("threads", "t") {
   description "Number of threads"
diff --git a/sub_commands/mem_main_cmdline.yaggo b/sub_commands/mem_main_cmdline.yaggo
index 20d012c..38c773d 100644
--- a/sub_commands/mem_main_cmdline.yaggo
+++ b/sub_commands/mem_main_cmdline.yaggo
@@ -19,7 +19,7 @@ option("mer-len", "m") {
   description "Length of mer"
   uint32; required }
 option("size", "s") {
-  description "Initial hash size"
+  description "Initial hash size in bytes"
   uint64; suffix }
 option("counter-len", "c") {
   description "Length bits of counting field"