diff --git a/12_2_Using_Other_Script_Commands.md b/12_2_Using_Other_Script_Commands.md
index 1daa3f3..af30e4e 100644
--- a/12_2_Using_Other_Script_Commands.md
+++ b/12_2_Using_Other_Script_Commands.md
@@ -18,7 +18,7 @@ Manipulate one number:
 
 Also see: `OP_0NOTEQUAL` (0x92)
 
-Manipulate two number mathematically:
+Manipulate two numbers mathematically:
 
 * OP_ADD (0x93) — Add two numbers
 * OP_SUB (0x94) — Subtract two numbers