diff --git a/en-us/sc/quickstart/limitation.md b/en-us/sc/quickstart/limitation.md
index 41ebe33c6e..81f3994cc6 100644
--- a/en-us/sc/quickstart/limitation.md
+++ b/en-us/sc/quickstart/limitation.md
@@ -45,7 +45,7 @@ A numeric type, `VARINT`, is represented as `BigInteger` in the underlying imple
 Additionally, these are supported for C#  `BigInteger` ：
 
 ```c#
-ulongtotal_neo = 200;
+ulong total_neo = 200;
 BigInteger ico_neo = 300;
 BigInteger balance_neo = total_neo- ico_neo;
 ulongvalue = 150;
@@ -249,4 +249,4 @@ Executing a function with the `NonemitWithConvert` attribute actually executes a
 
 For example,  `“ABCD”.ToScriptHash();` is valid as the compiler can make a conversion to “ABCD”.
 
-However,  `Stringxxx;….;xxx.ToScriptHash();` is invalid as the compiler cannot determine the value of XXX.
\ No newline at end of file
+However,  `Stringxxx;….;xxx.ToScriptHash();` is invalid as the compiler cannot determine the value of XXX.