diff --git a/src/ui/CSimpleEditBox.cpp b/src/ui/CSimpleEditBox.cpp
index 04f50f5..b53250c 100644
--- a/src/ui/CSimpleEditBox.cpp
+++ b/src/ui/CSimpleEditBox.cpp
@@ -177,7 +177,7 @@ void CSimpleEditBox::DeleteHighlight(int32_t a2) {
     // TODO
 }
 
-void CSimpleEditBox::DeleteSubstring(int32_t left, int32_t right, int32_t a4) {
+void CSimpleEditBox::DeleteSubstring(int32_t left, int32_t right, int32_t userInput) {
     auto v5 = this->m_textInfo;
     auto v6 = left;
 
@@ -292,7 +292,7 @@ LABEL_12:
 
         this->m_dirtyFlags |= 0x1 | 0x4;
 
-        if (!a4) {
+        if (!userInput) {
             this->m_dirtyFlags |= 0x8;
         }
 
diff --git a/src/ui/CSimpleEditBox.hpp b/src/ui/CSimpleEditBox.hpp
index a876e97..5dfe1c4 100644
--- a/src/ui/CSimpleEditBox.hpp
+++ b/src/ui/CSimpleEditBox.hpp
@@ -98,7 +98,7 @@ class CSimpleEditBox : public CSimpleFrame, CSimpleFontedFrame {
         void DeleteBackward(int32_t a2);
         void DeleteForward(int32_t a2);
         void DeleteHighlight(int32_t a2);
-        void DeleteSubstring(int32_t left, int32_t right, int32_t a4);
+        void DeleteSubstring(int32_t left, int32_t right, int32_t userInput);
         void DispatchAction(int32_t action);
         int32_t GetNumToLen(int32_t offset, int32_t amount, bool a4);
         void GrowText(int32_t size);