diff --git a/.gitignore b/.gitignore
index 62065ab2..2a1fd28a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,5 @@ api.json
 nodes.json
 nohup.out
 *.tokens
+recording.jsonl
+
diff --git a/README.md b/README.md
index 0c467200..b84315b8 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,10 @@ Algol Family [https://wiki.c2.com/?AlgolFamily](https://wiki.c2.com/?AlgolFamily
 - import analysis support
     - in C#, import `namespace` can use call in namespace
 
+### C issue
+
+Since Macro can be everywhere, If your code includes lots of Macro, it will be slow.
+
 ### Kotlin
 
 - need to implementation `warpTargetFullType` to got Class in same package.
diff --git a/chapi-ast-c/src/main/antlr/C.g4 b/chapi-ast-c/src/main/antlr/C.g4
index ac518b3b..cfe83296 100644
--- a/chapi-ast-c/src/main/antlr/C.g4
+++ b/chapi-ast-c/src/main/antlr/C.g4
@@ -474,7 +474,7 @@ macroStatement
 
 singleLineMacroDeclaration
     : '#' include (StringLiteral | ('<' includeIdentifier '>' ))                         #includeDeclaration
-    | '#' macroKeywords expression* (',' (expression | singleLineMacroDeclaration))*     #defineDeclaration
+    | '#' macroKeywords expression*                                                      #defineDeclaration
     | '#' '#'? Identifier                                                                #macroCastDeclaration
     ;
 
diff --git a/chapi-ast-c/src/test/kotlin/chapi/ast/cast/CFullIdentListenerTest.kt b/chapi-ast-c/src/test/kotlin/chapi/ast/cast/CFullIdentListenerTest.kt
index 1042bdde..d5531110 100644
--- a/chapi-ast-c/src/test/kotlin/chapi/ast/cast/CFullIdentListenerTest.kt
+++ b/chapi-ast-c/src/test/kotlin/chapi/ast/cast/CFullIdentListenerTest.kt
@@ -17,7 +17,7 @@ internal class CFullIdentListenerTest {
                 CAnalyser().analysis(it.readText(), it.name)
                 val end = System.currentTimeMillis()
                 val seconds = (end - start) / 1000
-                println("cost ${end - start}ms ~ ${seconds}s")
+                println("cost ${end - start}ms")
             }
         }
     }