diff --git a/doc/1.5.1_c_basic.md b/doc/1.5.1_c_basic.md
index 473ddc6..e9ff55c 100644
--- a/doc/1.5.1_c_basic.md
+++ b/doc/1.5.1_c_basic.md
@@ -247,7 +247,7 @@ unsigned int var2 = 0;
 
 - 0x7FFFFFFF = 2147493647
   - 01111111111111111111111111111111
-- 0x80000000 = -2147483647
+- 0x80000000 = -2147483648
   - 10000000000000000000000000000000
 - 0xFFFFFFFF = -1
   - 11111111111111111111111111111111