diff --git a/src/llvm/abi.cr b/src/llvm/abi.cr
index 394f3e912aeb..6b3f51ee0fbb 100644
--- a/src/llvm/abi.cr
+++ b/src/llvm/abi.cr
@@ -1,4 +1,3 @@
-# Based on https://github.com/rust-lang/rust/blob/master/src/librustc_trans/trans/cabi.rs
 abstract class LLVM::ABI
   getter target_data : TargetData
   getter? osx : Bool
diff --git a/src/llvm/abi/x86.cr b/src/llvm/abi/x86.cr
index 28d0a6aabfb2..64976863a47c 100644
--- a/src/llvm/abi/x86.cr
+++ b/src/llvm/abi/x86.cr
@@ -1,6 +1,5 @@
 require "../abi"
 
-# Based on https://github.com/rust-lang/rust/blob/master/src/librustc_trans/trans/cabi_x86.rs
 class LLVM::ABI::X86 < LLVM::ABI
   def abi_info(atys : Array(Type), rty : Type, ret_def : Bool, context : Context)
     ret_ty = compute_return_type(rty, ret_def, context)
diff --git a/src/llvm/abi/x86_64.cr b/src/llvm/abi/x86_64.cr
index 2c91c6b233e5..9ce1b799ce83 100644
--- a/src/llvm/abi/x86_64.cr
+++ b/src/llvm/abi/x86_64.cr
@@ -1,6 +1,5 @@
 require "../abi"
 
-# Based on https://github.com/rust-lang/rust/blob/master/src/librustc_trans/trans/cabi_x86_64.rs
 class LLVM::ABI::X86_64 < LLVM::ABI
   def abi_info(atys : Array(Type), rty : Type, ret_def : Bool, context : Context)
     arg_tys = Array(LLVM::Type).new(atys.size)